Windows 7

[ddouglass]

Are you only using this computer for Hoster? I know that Microstudio does not like 64 bit systems.
To expand on what Billyo said XP to Windows 7 upgrade won't work so requires stripping XP and clean load of Windows 7. Vista to Windows 7 upgrade does work according to Microsoft. The reason this works is that Windows 7 is Vista based same way XP was NT based.
MTU has done beta testing with Windows 7 and has not run across any problems with it. Most likely this is because they worked so hard to get Vista working and both are the same basic system.