Just used hiren's 15 bootcd and ran a scan for virus's. Found 1887 infected files. After that the pc just logs on and off again. Tried safe mode and administrator, still does the same thing. Tried using the windows xp cd, but it just comes up with an error halfway whilst loading, so there's no chance of doing a repair from the cd. I've tried using various xp cd's but still the same result. please help me guys.