I have a p4-ht 3.20 GHZ processor with 1GB RAM an running on xp. First problem was i lost my quick lunch on the bottom left side of the tool bar. Then my pc kept repeating updates install,evey time it installed an reboot.then it stoped, then when i thought it was ok it just turned off. I am still unable to turn it back on.I have tried a new power pack, also changed the processor fan. The heat sink on the processor looked very hard ,an dry. Can any one help.