You mean I CAN'T uninstall Visual Studio 2008? I had the unhappy luck of failing the VS2008 SP1 install, so I figured to uninstall and reinstall and then add back SP1. Sadly, my visions of a productive coding day disappears with this obscure error: "vs_setup.msi cannot be opened."
A bit of googling found a relevant post and after finding the appropriate installer key for "Microsoft Visual Studio 2008 Standard ENU" I was able to get back to work.
Run regedit and find this key:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products
\E05F434F41678AE30980F28B666B79AD
Or this key if you have the professional edition (Thanks Jul!):
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products \4E1DAD7D4F54B2B398A9AE271876CEF4
Underneath that one was a folder called Patches. Within that folder
was an entry called Patches of type REG_MULTI_SZ. I right-clicked and renamed to Patches_1.
Rerun the setup.exe for VS2008. Return to coding.