Security company AVG has apologised to customers after an update caused Windows systems crashes.
The update was sent out on Thursday, and caused computers to go into an infinite crash loop when rebooted.
Update 3292 for AVG 2011, for both the free and paid-for versions of the software, caused systems crashes on Windows 7 64-bit computers.
"AVG is very sorry for the inconvenience this has caused our customers and we are committed to helping those that have been impacted get back on track," said the company in a statement. "AVG's priority has been to quickly assess and respond to the issue."
Affected customers should disable AVG by using AVG's rescue CD and following instructions on the AVG forum, the company said. If this is not possible, business customers should call AVG on +1-828-459-5436 or skype:avg-nc between 2:30pm-11:30pm UTC, while home and free customers should call AVG 24 hour support on +1-877-367-9933.