Weird annoying errors after fresh format

[krzyazn]

Hi for some reason my computer has been experiencing some weird problems over the last week. I have done about 4 reformats in hopes of solving these errors but nothing is working. The current symptoms are as follows:

- sometimes a message box would pop up randomly saying fatal uncorrectable error and my computer would just restart

- my internet connection gets a limited or no connectivity and i have to repair it many times. this mostly happens when i go away from keyboard for a few minutes

- my vista theme suddenly turns into the classic xp white theme, everything closes, and my computer restarts

- 5 cmd.exe pops up and a ton of info is being processed extremely fast i dont even know what and sometimes after the problem just above this happens and restarts

- some applications freeze up and i cant click on the process or do anything in it until i end that process and start it up again
ex. explorer.exe or aim6.exe
they freeze up and i cant use the start menu or close the aim client with the x. when i try to, it makes a short weird sound. i have to end the processes and re open them

- sometimes my typing will get all messed up temporarily ranging from 10-30m. EDIT i just found out there has been some program named svchost.exe which acts like a autoit script in my system tray that seems to be disabling typing letters and spacing and such. i dont know where it came from because i have just done a fresh reformat and have not downloaded anything

Does anyone know what is wrong with my computer? is it a hardware issue or what?

Im running Windows Xp Sp2
Amd Sempron 2500+
1.74 ghz
512mb ram
Geforce 2 Mx/Mx 400 video card
2 Western Digital 40gb hard drives (one is a backup drive)