It's quite possible that, during the system disinfection, a system file may have been corrupted or deleted by AVG which is adversely affecting your bootup.
I responded to your other thread about accessing the recovery partition but, should you not wish to take that route, you may still be able to boot into Safe Mode w/ Command Prompt and run chkdsk /r (checks for and attempts to repair file system errors) and/or fixboot (attempts to fix the Master Boot Record).
Personally, I'd recommend just doing a system recovery and next time you should make your recovery discs (it prompts you when you first boot it up and will keep annoying you until you make them, unless you tell it not to).
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