84,488,480 programs installed

Should I remove O&O Defrag Professional?

What percent of users and experts removed it?
5% remove it95% keep it
Overall Sentiment
What do people think about it?
(click star to rate)
How common is it?
Global Rank #2,198
United States Rank #4,810
Reach 0.2967%
Lifespan of installation (until removal)
< 9.99 days
294.60 days >
Average installed length: 154.79 days


21.2.2011 0.05%
21.1.1211 1.17%
21.0.1115 0.14%
21.0.1107 0.02%
20.5.603 1.06%
20.0.465 0.71%
20.0.457 0.65%
20.0.449 0.19%
20.0.427 0.82%
19.5.222 2.91%
19.0.99 2.70%
19.0.87 1.34%
19.0.69 0.02%
18.10.103 0.58%
18.10.101 2.56%
18.9.60 1.08%
18.0.39 9.97%
17.5.581 0.02%
17.5.559 11.09%
17.5.557 0.24%
17.0.504 5.48%
17.0.490 1.60%
17.0.476 1.74%
17.0.468 1.69%
17.0.422 1.41%
17.0.420 1.52%
16.0.367 3.28%
16.0.345 5.44%
16.0.318 0.70%
16.0.306 3.09%
16.0.183 3.38%
16.0.151 1.43%
16.0.141 0.40%
16.0.139 2.39%
15.8.823 0.56%
15.8.813 0.91%
15.8.809 3.28%
15.8.801 3.78%
15.5.323 0.78%
15.0.123 0.02%
15.0.107 1.48%
15.0.99 0.30%
15.0.83 0.44%
15.0.73 1.64%
14.5.543 1.06%
14.5.539 0.24%
14.1.431 1.15%
14.1.425 0.31%
14.1.305 1.74%
14.0.205 1.19%
14.0.177 0.68%
64 versions

Typically installed together

O&O Defrag Professional

Remove O&O Defrag Professional
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What is O&O Defrag Professional?  (from O&O Software GmbH)

If you work on computers a lot, then slow system and program starts, endless rendering and memory processes, or even system crashes when playing can quickly ruin your enjoyment. Defragmenting your PC can hugely accelerate the speed you can work on your PC. When you defragment, those files fragmented across the hard dis...  Read more


O&O Defrag Professional is a program developed by O&O Software GmbH. The most used version is 17.5.559, with over 98% of all installations currently using this version. Upon installation and setup, it defines an auto-start registry entry which makes this program run on each Windows boot for all user logins. It adds a background controller service that is set to automatically run. Delaying the start of this service is possible through the service manager. A scheduled task is added to Windows Task Scheduler in order to launch the program at various scheduled times (the schedule varies depending on the version). The software is designed to connect to the Internet and adds a Windows Firewall exception in order to do so without being interfered with. When installed, it will add a context menu handler to the Windows shell in order to provide quick access to the program. The main program executable is oodag.exe. The software installer includes 35 files and is usually about 67.55 MB (70,826,578 bytes). ooliveupdate.exe is the automatic update component of the software designed to download and apply new updates should new versions be released. In comparison to the total number of users, most PCs are running the OS Windows 7 (SP1) as well as Windows 10. While about 32% of users of O&O Defrag Professional come from Germany, it is also popular in the United States and France.

Program detailsProgram details

URL: www.oo-software.com
Installation folder: C:\Program Files\OO Software\Defrag\
Uninstaller: MsiExec.exe /I{0C6CDC1E-F247-45FD-BEC7-47014D2698C1}
(The Windows Installer is used for the installation, maintenance, and removal.)
Estimated size: 67.55 MB
Language: English (United States)

Program filesFiles installed by O&O Defrag Professional

Program executable:oodag.exe
Name:O&O Defrag
O&O Defrag Agent (x64)
Path:C:\Program Files\OO Software\Defrag\oodag.exe
Additional files:
  • ooliveupdate.exe - O&O LiveUpdate
  • oodagmg.dll - O&O Defrag (O&O Defrag Agent Message DLL (GER) (x64))
  • oodagrs.dll - O&O Defrag Agent Resource DLL (GER) (x64)
  • oodcmd.exe - O&O Defrag CommandLine Utility (x64)
  • oodcmdrs.dll - O&O Defrag Commandline Resources (GER) (x64)
  • oodcnt.exe - O&O Defrag Container (x64)
  • oodexttl.dll - External Tools (x64)
  • oodguirs.dll - O&O Defrag Resources (GER) (x64)
  • oodjobd.dll - O&O Defrag Job Dialog (x64)
  • oodjobdr.dll - O&O Defrag Job Dialog Resource DLL (GER) (x64)
  • oodpeo.ocx - O&O Defrag OCX (x64)
  • oodpep.dll - O&O Defrag MMC plug-in (x64)
  • oodpesur.dll - O&O Defrag SplashUp Resources (GER) (x64)
  • oodpetpr.dll - O&O Defrag Tip Resources (ENU) (x64)
  • oods.exe - O&O DiskStat
  • oodsh.dll - O&O Defrag Shell Extension (x64)
  • oodshrs.dll - O&O Defrag Shell Extension Resource DLL (GER) (x64)
  • oodsvct.exe - O&O Defrag Service Control (x64)
  • oodtray.exe - O&O Defrag TrayIcon (x64)
  • oodtrrs.dll - O&O Defrag TrayIcon Resource DLL (GER) (x64)
  • oodwiz.dll - O&O Defrag Wizard (x64)
  • oodwizrs.dll - O&O Defrag Wizard Resource DLL (ENU) (x64)
  • oodwrtlic.exe - O&O Defrag License Writer (x64)
  • oodperwr.dll - O&O SDK (O&O Registration Wizard Resources (GER) (x64))
  • oorwiz2.dll - O&O Registration Wizard (x64)
  • oorwiz3.dll
  • oorwiz4.dll
  • oosu.dll - O&O SplashUp (x64)
  • ootip.dll - O&O Tip Dialog (x64)
  • ootmapi.dll - O&O TextMode Driver API (x64)

Program behaviorsBehaviors exhibited

Context Menu Handler
  • oodsh.dll added to Windows Explorer under the name 'OODefrag' with a class of {48EAD1E1-ECF2-4a85-AA09-1C44FBEED451}.
2 Scheduled Tasks
  • oodcnt.exe is scheduled as a task with the class '{33C36F4F-9A42-49A6-BCF3-1DE64A98AB0F}' (runs on registration).
  • oodag.exe is scheduled as a task with the class '{DEC25DE2-90EE-432F-A235-81F9A57E2707}' (runs on registration).
Scheduled Task (Boot/Login)
  • oodtray.exe is automatically launched at startup through a scheduled task named OODefragTray_Reg_HKLMRun.
  • oodag.exe runs as a service named 'O&O Defrag' (OODefragAgent).
Startup File (All Users Run)
  • oodtray.exe is loaded in the all users (HKLM) registry as a startup file name 'OODefragTray' which loads as C:\Program Files\OO Software\Defrag\oodtray.exe.
Windows Firewall Allowed Program
  • oodag.exe is added as a firewall exception for 'C:\Program Files\OO Software\Defrag\oodag.exe'.

Program resource utilizationResource utilization averages

Memory:21.47 MB
21.09 MB average
Total CPU:0.0030604853%
0.031193% average
Kernel CPU:0.00128688%
0.016088% average
User CPU:0.00177360%
0.015104% average
70 average
Memory:5.74 MB
Total CPU:0.0017166189%
Kernel CPU:0.00055845%
User CPU:0.00115817%

How do I remove O&O Defrag Professional?

Quickly and completely remove O&O Defrag Professional from your computer by downloading Reason's ‘Should I Remove It?’ (click the button below).
Or, you can uninstall O&O Defrag Professional from your computer by using the Add/Remove Program feature in the Window's Control Panel.
  1. On the Start menu (for Windows 8, right-click the screen's bottom-left corner), click Control Panel, and then, under Programs, do one of the following:
    • Windows Vista/7/8: Click Uninstall a Program.
    • Windows XP: Click Add or Remove Programs.
  2. When you find the program O&O Defrag Professional, click it, and then do one of the following:
    • Windows Vista/7/8: Click Uninstall.
    • Windows XP: Click the Remove or Change/Remove tab (to the right of the program).
  3. Follow the prompts. A progress bar shows you how long it will take to remove O&O Defrag Professional.

Win 7 (SP1) 57%
Win Server 2003 0%
Automatically starts? Yes
(Found in the run registry)
Uninstall it 5%
Keep it 95%

Windows OS versionsWindows

Which Windows OS versions does it run on?
Windows 7 60.49%
Windows 10 30.82%
Windows XP 5.99%
Windows Vista 2.68%
Windows Server 2003 0.02%
Which OS releases does it run on?
Windows 7 Ultimate 25.00%
Windows 7 Home Premium 21.40%
Windows 7 Professional 11.68%
Windows 10 Pro 7.02%
Windows 8.1 Pro 6.02%
Microsoft Windows XP 5.98%

Distribution by countryGeography

32.26% of installs come from Germany
Which countries install it?
  Germany 32.26%
  United States 19.05%
  France 8.75%
  United Kingdom 3.58%
  Italy 2.83%
  Russia 2.34%
  Poland 2.00%
  Austria 1.94%
  Netherlands 1.92%
  Canada 1.85%
  Czech Republic 1.53%
  Belgium 1.43%
  Romania 1.11%
  Switzerland 1.08%

OEM distributionPC manufacturers

What PC manufacturers (OEMs) have it installed?
Acer 19.48%
Hewlett-Packard 16.50%
ASUS 14.86%
Dell 14.79%
Medion 8.49%
Lenovo 3.20%
Intel 2.77%
American Megatrends 1.97%
Samsung 1.20%
MSI 1.13%
Toshiba 0.98%
Common models
ASUS All Series 11.73%
HP Pavilion dv7 Notebook ... 4.86%
MEDIONPC MS-7502 3.59%
HP Pavilion g6 Notebook P... 2.96%
HP Pavilion dv6 Notebook ... 2.85%
MEDIONPC MS-7728 2.64%

About O&O Software GmbH

The company develops and sells software products for data management and security, the first product beingO&O Defrag.
Publisher URL: www.oo-software.com

comments1 comment

user comment
user comment
Heinzyover a year ago
Have used this program since version 4. An annoying feature (V16) is the pop-up reminders of an upgrade, not an update. Disabling the "startup" entry file "trayapp" removes the pop-ups seemingly without affecting the program.