A nasty post-patch surprise awaits some Vista users: IE may fail to start.

Here's the problem: if you've changed the location of Vista's Temporary Internet Files folder and employ the antiphishing filter, IE might not be able to use that new folder location. The workaround involves moving the folder back to its original location or changing the permissions on its new location.

Some Windows XP SP2, Windows 2000 SP4 and Windows Server 2003 users had trouble with Windows Update and Microsoft Update. When Windows scanned automatically for updates, or when the user went to the Update site, the PC's CPU sometimes bogged down and became unresponsive.

Microsoft released a patch for this serious issue but, in some PCs, the hotfix not only failed to work, it caused important system tasks to crash. Microsoft released a second patch that supersedes the first and will be distributed via Automatic Updates through the end of June; it's also available here. We'll see whether the second hotfix fully cures the problem.

See also:

Microsoft glitches hamper critical fixes

Office fix delayed

ActiveX flaw

Trillian IRC hole

Winamp fix