Installing Microsoft Office 2010 using the preinstalled "out of the box" function, I got this error:
Error 1913: Setup cannot update file C:\windows\win.ini
Permissions were right. I could rename the file, so that means it was not in use by some other program... but apparently it was Trend Micro blocking the installation.
Using services.msc I disabled all Trend Micro stuff, finished the install and rebooted to get all services running as normal.
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This trick worked for me:
Go to C:\Windows
Locate Win.ini file in Windows folder
Right click and rename it as Win.old
Reboot your computer
Install MS Office
Now repeat the step 1 to 3
Reboot you machine