First, please follow Hengis's instructions on updating java and flash.
You should for sure update windows frequently. There is a Hotfix for this in one of the updates I read and that could be your problem. Please update Windows by going to
Microsoft Windows Update. You may have to do this multiple times. I also highly recommend turning on Automatic Updates, by going to the Control Panel, going to Security Center and turning on Automatic Updates. This will significantly improve your computer's security and make it more stable to avoid issues like this.
Regards,
Adam