Possible virus question

Avast Free Antivirus / Premium Security
1

This has happened for the second time…

When I return to my computer after a couple of hours my computer has locked itself. I don’t remember the admin password to unlock and all the ones I can think of do not work. To get in I have to hit the reset button. I’ve run the virus scan and ad-aware se. It happened for the second time today, I think the first time was a couple of days ago.

Any thoughts? Thanks-vin

2

Just right click the desktop.
Choose Properties.
Screen saver tab of setting.
Uncheck the splash screen option.

Or, if it is not this problem, click on the Energy button and set the options for Hibernation and Stand By options.