Khayman's right. Honestly, if you have major stability issues with XP, don't expect any miracles from XP x64. The instability is almost certainly coming from poorly written third-party software, crap hardware, or shoddy drivers. Every OS has its bugs and issues, but you should NOT be experiencing major hangs, crashes and freezes under normal circumstances with XP, whether it be the 32-bit version of x64.