Attacks on computers running some versions of Microsoft operating systems have brought some users to a standstill.
Microsoft disclosed the flaw Thursday, leading to increased attacks from hackers.
The hole is connected to a file used each time you click an icon with your mouse. When your cursor changes to an hourglass, that opens a hole, putting your computer at risk.
Learn more about the threat through Microsoft's Security Alert, which you can find at the Related Link below.
The so-called "zero day attack" is apparently aimed at PCs running Windows Vista. However, PCs running some versions of Windows 2000, XP and some versions of Windows Server 2003 are also vulnerable.
So far, a security patch is not available, but Microsoft says it is working on a fix.