So you’ve got a little ext3 partition that you set up to share files between a Windows partition and a Linux partition. Then one day, while working in Windows, you decide to install say, Microsoft Visual C++ 2008 Express Edition with SP1 Setup. I know, I know.
Anyways, you run the little vcsetup.exe installer, and lo and behold it does not work. Something about the installer trying to copy a $shtdwn$.req file and failing miserably. Oh, you think, I know: a shutdown is required but is somehow not working, so you reboot and try it again, but it still fails. So you look around on the web, and find all sorts of discussions about IFS Drives and this particular error.
The solution is simple: Open up IFS Drives in the Control Panel, assign None to all the drives that you have mapped, then run the installer. After the installer has finished with its nefarious intentions, reassign the old drive letters to the drives, and you’re done.
You’re welcome, peace out