After auto-update I can’t boot in Windows 7 anymore. I tried windows restore with no success. I can’t even access safe mode since it hangs at aswRvrt.sys. It seems many users have had this problem so I followed the instructions here on the forum and I did an FRST scan. The log file is attached below. I would appreciate any help since I have important documents. Thanks in advance!
You forgot to attach the file addition.txt, please do so.
If you have “important” documents, you should have a backup of them.
I strongly suggest you boot from a live cd and make a backup before doing anything else.
I run the FRST file by booting from the OTLPENet cd. I pressed scan and then report but it just created the FRST.txt file, I didn’t find any addition.txt. Maybe I’m missing something?I was following the “if you can’t boot” section of this topic:http://forum.avast.com/index.php?topic=53253.0 Thanks for trying to help.
Btw it seems I forgot to check the three last options in the exe.
I can see no signs of malware. I can disable Avast for you but I do not feel that it will make any difference
Would checking the list BCD, drivers MD5 and addition.txt give any different results? The topic I was looking at had different options so I missed those. Btw checking the addition.txt doesn’t give me any addition.txt file to attach.
Disable avast and see if you can boot. It is often much easier to repair things when you can boot.
How can I disable avast?
This will disable all Avast services from loading
Download the attached fixlist.txt to the same location as FRST
Run FRST as before and press fix
Then try a reboot
Unspurprisingly it didn’t work 
I will just do a backup and reinstall windows. Thanks for your help so far.
It appears that some windows updates are conflicting with some security programmes and are causing this problem. But, there appears to be no common denominator with any affected systems
This is why its important to keep a system image handy. Windows even tells you this. You can insert your Windows disk and try doing a repair.