What were you even doing to get those viruses
Damn- I never liked msi boards for bios, layout and silly copper heatsinks. But I hope your DIMM slot didnt get loose.
Remove the cmos battery for around 1-2 minutes and restart to bios. Then check in BIOS how much rams are detected and then the temps. If your hardware friend has a ddr2 based system then get the ram and hard drives checked. Run orthos blend test (google it) or mem test it for 4-5 hours and run hd tach's error scan on hard drives. If both are good, well and good- if not rma them.
Get your power supply checked as well. Same goes for the mobo.