The latest software update from security supplier AVG Technologies has caused problems with many users running Microsoft's 64 bit Windows 7 operating system.
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The conflict between update 3292 for both free and paid-for versions of the software causes systems to go into an infinite crash loop, the company said.
AVG also said it will release a program to ensure that the fix is completed automatically as soon as possible.
Users who are running Windows 7 and have not downloaded and installed update 3292 will be unaffected, the company said.