If you are an average user, XP or Vista is ok for office or gaming. If you need it to do real work (MULYITASKING) then you need Linus , Unix or
VMS.

Windows Vista and the new "7" will be just like all other MS crap, never finished. Microsoft never gets a platform debugged and stable before moving onto another equally lame attempt a creating an Operating System. Until MS gets control of their DLL's their OS will always be unstable. The last half way stable platform was Windows 2000.
My 2 cents worth.