Still not stable ... those aren't happy words. Did you install Norton Internet security? If not, look at directdeals.com for OEM price. Did you apply all Windoze updates to XP? Are you sure that all components are properly seated? The next step would be to remove all devices and expansion cards except the video card and the HDD ... if not OK, it could be the HDD swap area. If it is stable, reinstall 1 component at a time and check the stability -- that would locate the component causing the problem. HTH ... but let me know if not.