Help, not sure where this goes.

Hey im not sure what forum i should put this in but here we go, i have an issue with my comp and for the life of me i cant figure it out, i just formatted and reinstalled xp pro, nothing else was installed and my keyboard of any letter number key would not type, although if i start in safe mode it works, whats with that? im also wondering if any of you guys know about any good formatting programs and memory integrity test programs and memory wipers? any help would be much appreciated. cheers