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Suddenly all https sites have expired certificates on all browsers, even formatting and reinstalling Windows didn't work! I tried many different connections as well.

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Have you checked that the clock in your computer is set to the right date?

Also, what sites? Maybe they actually are expired...

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+1 I'll bet a beer it's the system clock. – Pekka Mar 14 '11 at 19:06
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+1 for a suggestion I will file for future reference! – squillman Mar 14 '11 at 19:19
+1 - 9.5 out of 10 cases this happens is indeed due to a wrongly set system clock. – BloodPhilia Mar 14 '11 at 19:52
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Poor guy reinstalled Windows! – slhck Mar 14 '11 at 20:00
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Could be due to a dead CMOS battery – ChrisF Mar 14 '11 at 20:11
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I have seen this after creating a test AD CS server on my domain. It was a lone CA and no external certificates were working. Probably not your case, as it should have been documented if a CA came up in your infrastructure. But just in-case, also I cannot leave comments. :(

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