Windows 7 (Ultimate)
This download is served from an external siteclose
NOTICE: This link will open a connection to a third-party site. CNET cannot ensure the security of software that is hosted on external sites.
Full user review
"The best operating system so far from microsoft"
Much smoother running than Vista. Improved user interface. Compatible with older software.
I installed the 64 bit version. It might have been a mistake, as I have less than 4GB ram memory, and there are almost no applications for 64 bit.