Hi Claire
It could be so many different things but i suspect a virus....
Can you boot it in safe mode? Preferably with networking and do a virus scan?
To boot in safe mode when you turn it on repeatedly press f8 until you come to a different screen than usual and select safe mode
Post back if you can do that please and i'll try and help you from there
Cheers Claire
Claire Howlett
December 2010
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