AAVM / PRC error

I have new install avast, but a error >>AAVM subsystem… PRC
Any one ideas?
Thanks

did you uninstall your previous used AV before installing avast?
did you run the vendors removal tool to clear all leftover files that may conflict?

General: Uninstalling a third-party antivirus software http://www.avast.com/en-eu/faq.php?article=AVKB11#artTitle / http://www.avast.com/zh-cn/faq.php?article=AVKB11#artTitle

Thanks
I uninstall the AVIRA and AVAST
reinstall avast, same problem!
And I find that windows update is missed!
OH my god!
May be the 2 AV kill my win 7 windows update.
Please help !!!

attach (not copy and paste) OTL diagnostic log http://forum.avast.com/index.php?topic=53253.0

when done a log expert will take a look