I manually uninstall Office by the steps below:
1. Download and install the Windows Installer Cleanup Utility.
http://download.microsoft.com/download/E/9/D/E9D80355-7AB4-45B8-80E8-983A48D5E1BD/msicuu2.exe
2. After you install the Windows Installer CleanUp Utility, click Start -> All Programs -> Windows Install Clean Up.
3. Highlight Microsoft Office 2010 entry in the list and then click Remove. Quit the Utility.
Note: If you have got any other old or redundant office entries such as Office 2007 or other Office standalone products, such as Visio in the list, please remove them together.
4. Close all applications.
5. Click the “Start” peal, in the Search box, type "regedit" (without the quotation marks) and press Enter.
Note: If you are using Windows XP, click Start -> Run, type "regedit" (without the quotation marks) and press Enter.
6. Expand the registry tree on the left pane and locate the following two registry subkeys:
HKEY_CURRENT_USER\Software\Microsoft\Office
HKEY_LOCAL_MACHINE\Software\Microsoft\Office
7. Right-click on this registry subkey and click Delete to delete those keys.
8. Open Windows Explorer, and then browse to the "C:\Program Files" folder
If it exists, rename the "Microsoft Office" to "Microsoft Office OLD"
If it exists, rename "OfficeUpdate" to "OfficeUpdateOLD"
If it exists, rename "OfficeUpdate14" to "OfficeUpdate14OLD"
9. Click Start, in the Search box, type "%Temp%" (without the quotation marks) and press Enter.
10. Empty the Temp folder.
Note: If some files can't be deleted, please skip them, which don't influence the result of the troubleshooting.
11. Empty the Recycle Bin.
12. Restart your computer, and try to install Office 2010 again
But my problem is the step 6 that HKEY_LOCAL_MACHINE\Software\Microsoft\Office not delete even in safe mode
http://ups.night-skin.com/uploads/89-9/1327775336.jpg
