While four of the six security bulletins that Microsoft issued for April's Patch Tuesday release are rated "critical," one in particular has already been targeted by an attack lurking in the wild.

Microsoft today said it will deliver 10 security updates next week to patch a record-tying 34 vulnerabilities in Windows, Internet Explorer, Office and SharePoint.

Microsoft Tuesday issued two security updates detailing patches for applications in Windows and Office that the company deemed critical, because one of the vulnerabilities could sneak up on administrators via third-party software installations.

Microsoft has re-released a buggy update that didn't properly protect some of its Windows 2000 users from a security flaw.

Microsoft has fixed a problem in Office 2003 that prevented the software from opening documents saved using its access control technology.

Microsoft's latest round of security patches appears to be causing some PCs to seize up and display a black screen, rending the computer useless.

Microsoft today patched 15 vulnerabilities in Windows, Windows Server, Excel and Word, including one that will probably be exploited quickly by hackers. None affect Windows 7, the company's newest operating system.

In further confirmation that Internet crooks tend to grab for the low-hanging fruit, a new Microsoft report reveals that the most common browser-based attacks tend to go after old software flaws. Making sure you've closed those holes can go a long way towards keeping your PC safe.