It does seem strange that it suddenly de-activated.
Im sure the Orbit30 ULoader 8.0 will fix. or even ODIN will fix. but first several things need to be checked.
1. Download Slic-dump and run as admin, then post the advanced tab so we can tell. if your showing SLIC 2.1

http://fliiby.com/file/852398/yjzywbfd0u.html
No Pass My upload
2. Does the SLIC agree with your BIOS. copy of my Acer A0751h - Bios for Acer should = Acer SLIC, Dell = Dell, for sample.
If your BIOS does not agree with the SLIC reading.... that could be the cause.
3. KB971033 should not De-activate unless the KEY and Certificate does not agree. (Did you attempt a Dual Boot?)
OEM Activation needs SLIC 2.1 for 100% proper Activation.
4. mini-KMS Activator for Office 2010 should in no way effect the Activation, unless for some reason, SPP was disabled, which would also stop the KMS activator from working.
5. Test per following an see: slmgr.vbs -dli & slmgr.vbs -dlv & slmgr.vbs -xpr. will show license info and expire time.

Yes, this shows RETAIL but OEM should be the same... only OEM.
If your still not activated.... plz post a snip of your dli & dlv & xpr.
then suggest you run slmgr.vbs -rearm ( rearm will-unless 100% Non-Genuine will give you 30 days . )
Lets try and find why this install failed before we use a different PATCH to correct.