My computer slowed up a couple of days ago. Now it takes hours sometimes to open a program. I tried deleting cookies and history but the computer ran for 7 hours and it was still - I presume - trying to delete cookies and windows. It must have "hung up: What can one do at home to remedy this?
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Sounds like you acquired a virus. Run your anti-virus program; you may have to do it in the SAFE mode - re-start the computer and press the F8 key after POST, but before booting to WinXP.