Microsoft recently published a security alert on a new "hole" in all windows products that is now being exploited. As simple as I can put it, this new attack exploits the tiny program that turns the machine code of .jpg files into the image you see on your computer monitor. There are patches available at:
http://windowsupdate.microsoft.com
as this problem affects other microsoft programs such as Microsoft Office, Visio, etc. you will aslo need to get another patch at:
http://office.microsoft.com/en-us/of...e/default.aspx
If you don't already visit these two sites regularly (this does not apply to you Apple folks) the I VERY HIGHLY recommend you make it part of your computer routine (once a week). Its a bit of headache, but then, so is losing all your computer files