Hi,

a) try AV-Boot-Disks, e.g. from www.fprot.org/fr_boot.htm or similar f-secure/F-prot pages

b) if an AV-Bootscan doesn’t reveal viruses, this sounds more like hardware error…
could be RAM; harddisk, motherboard, graphics-card, powerunit etc…
Try googleing for RAM-tests and
Harddisk diagnosis tools from your harddisk vendor

Please describe your hardware as detailed as possible for further analysis
:wink: