Microsoft has warned Windows XP users not to press the F1 key if prompted to do so by a Web site.

"In a security advisory issued late Monday, Microsoft confirmed the unpatched bug in VBScript that Polish researcher Maurycy Prodeus had revealed Friday, offered more information on the flaw and provided some advice on how to protect PCs until a patch shipped," writes Computerworld's Gregg Keizer.

"'The vulnerability exists in the way that VBScript interacts with Windows Help files when using Internet Explorer,' read the advisory. 'If a malicious Web site displayed a specially crafted dialog box and a user pressed the F1 key, arbitrary code could be executed in the security context of the currently logged-on user.'"

Click here to read the Computerworld article.