sorry for the late reply. I have been very busy these few days
These symptoms aren't caused by malware.
Put the Windows CD into the computer.
Open the Start Menu > Run.
Type:
At the prompt, type:cmd
.sfc /scannow
It will check your system files and replace them where needed
At the end it will tell you the result, please post it here
Next:
Try now with MBAM and tell me if it still crashes.
Next:
Check your computer and tell me if the symptoms you described above are still there