[Haskell-cafe] GHC doesn't work

Greetings. I have a PC that had GHC 6.6 running on it. Worked fine. Then I uninstalled 6.6 and installed 6.6.1, and now it doesn't appear to work at all. Any attempt to run GHC results in a message that says The entry point OpenThread could not be found in KERNEL32.dll. or something very similar to that. Is this likely to be because GHC 6.6.1 doesn't support Windows NT, or because my PC is messed up?