Uninstall and Remove Software in Safe Mode
Click the Start button. In the Search field, type regedit and press Enter.
Right click over the regedit.exe that comes into search list; select “Run as Administrator“. Accept the security Prompt. Registry Editor will open.
Locate the following registry key:
Right-click on the Mininal key and from the menu select New – Key:
Now name the new key MSIService and change the value to Service by double-clicking it:
If you are in the Safe Mode with Network Mode, repeat the above steps for the following registry key:HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\
The newly created MSIService will make available the Windows Installation Service in Safe Mode. However, I want to remind you that it is necessary to turn the new service on.
To do it, exit regedit, click Start and in the Search field type: services.msc and right click over the “services.msc” that comes into search list; select “Run as Administrator”. Accept the security Prompt.
From the list, locate Windows Installer. Right-click it and select Start:
Note: If the procedure to turn on Windows Installer does not work try this one:
1. Open an elevated command prompt.
NOTE: Right click the Command icon, and click Run as administrator.
2. In the command prompt, type net start msiservice and press Enter.
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Original source: The Customize Windows http://www.sevenforums.com/tutorials/117840-uninstall-remove-software-safe-mode.html