I have a Sony Vaio running Windows Vista. Today when I turned it on and it ran though the VAIO screen but stuck on the screen where I would normally click on a user to log in. I have attempted restarting it several times and it seems as though it freezes at a slightly different point each time. I am able to boot in safe mode but not in safe mode with networking. Sometimes during the safe mode boot it will pause for a bit on AVG before finally booting. Please help.