Gateway Celeron 700. 512 Meg Ram. XP Home. Computer will intermittently freeze requiring a hard restart. Usually occurs in Internet explorer. Has occurred while trying to access “add/remove programs” and online “Windows Update.” It cannot be spyware/virus. After running (safe, syst rest off) both Norton and AVG; MS antispy, spybot, and adaware and finding nothing significant, I reinstalled XP and SP2 from disk on a new hard drive and still acts the same way. (did not freeze during the whole reinstall procedure.) Replaced the power supply. Same problem. Checked/replaced memory. Same problem. I removed the pci modem and ethernet cards and have not had a freeze, but then again it’s hard to get online without them. Replaced the ethernet card with a different brand that works fine in another computer. Same problem. Tried different pci slots. Same problem. Any suggestions???