My MPB randomly returns to log in screen

I have a:
  Model Identifier:
MacBookPro6,2
  Processor Name:
Intel Core i7
  Processor Speed:
2.66 GHz
and am currently running 10.6.8...
I use my laptop in lectures a lot and it seems that randomly (usually when I'm typing quite a lot) the whole screen rotates as a cube and returns to the log in screen asking me for my password.
Once I log in it rotates back exactly where I left off, only there will be a chunk missing from audio (if I'm recording)
It is really anoying, if anyone has any advice how to stop this it would be much appreciated...
(It began doing it when I uprgaded to Lion so I reverted to Snow Leopard but now that I'm back at university the problem has reappeared even in Snow Leopard... just not quite as frequently as before.)

Sorry.
Yes I can log in but as soon as I do the same malware message pops up then my mac resets back to the log in screen and this loop just keeps repeating itself. Log in, when I do at it loads I get the malware sign, then it crashes and returns me to the log in, repeat. After logging in, my mac is unresponsive so I can't seem to do anything before it goes back to the log in screen.
I'm able to use my mac as normal when opened in safe mode, and I have tried turning off the log in password screen. Then when I try to use my mac out of safe mode the same message comes up then it just crashes, reloads then crashes again.

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