Have worked with Windows for 10 years - have seen pretty much all major issues of 2000, XP & Vista, and can probably resolve most Windows/OS-related issues...
Microsoft made an excellent job of Windows 7 and I use this in preference to OpenSuSE & Fedora now.
A big fan of VmWare - some really good virtualization options available now.
Update (May 08)
No longer participating regularly; I am tired of power-hungry admins and moderators, who have grandiose notions that they are more important to EE than participating Experts - especially a couple around the XP/Microsoft OS zones.
One last thing - Experts that participate in answering questions are VOLUNTEERS. If you treat us respectfully - then you can expect the same in return.