Mouse and keyboard making the comp crash

Asus P4P800 SE (BIOS 1008.04) a 1009.01 beta version is available
Pentium 4 3.0E Ghz HT
Onboard sound
Onboard LAN
ATI Radeon 9200 SE
Logitech Optical Mouse
generic keyboard

here's the problem. I took my comp to my friend house because we were doing a LAN. Everything worked fine except that I got infected with Trojan.Agent.8B or something like this but I got rid of it pretty fast (with AVG)but it deleted cisvc.exe (not able to heal).

WhenI came back home and plugged all the stuff I put the mouse in the keyboard port and vice-versa. I rebooted 3 time before I noticed and I replugged them correctly. When I restarted my comp I had a message that said the overclock had failed but the system continued booting and I got in Windows. I played CS:S for about 3 hours and then the comp froze. I could still see the connection error flashing in the top-right corner of the screen but nor my keyboard or my mouse responded. After this it kept crashing randomly. The programs look to keep running but the only thing I can do is hit reset on my comp.

Oh yeah I had to remove the heatsink to clean it but I didn't had any "thermal paste" to put between the CPU and the heatsink so this might be a problem too. At 60% load the CPU get in the mid 50 celcius

Any idea on what is crashing up my comp ??? Well I'll prefer solution but :P

I'm gonna buy the thermal paste right away and I'll see if it solve the problem but everything ran fine before.

Thanks for your help

Ok I just verified and my BIOS was 1004.003 which is the factory one .... I guess I flashed the BIOS somehow when moving or replugging things on it. I installed the last beta BIOS and dled the final one just in case. I'll post back the result later.

It lasted longer without crashing with the new BIOS but I get back and checked the setting in it. Some of them were messed up like the AGP memory and some support things.