Microsoft is warning Windows Vista users that a forthcoming service pack for the operating system may stop some third-party programs working.
The software giant has released a list of programs that may be broken by the SP1 update for Vista.
Most of the software hit by the upgrade are security programs that prevent Windows users falling prey to viruses, trojans and booby-trapped webpages.
The Windows Vista update will be released to the public in mid-March.
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