Help Avast Free Edition

I installed avast free edition, and everything is fine until I restarted my laptop, I signed up and when I turn on my laptop, there is text that not registered, and the remaining subcription 0 days, whereas before there were still 366 days, and when I press resolves all, avast is not responding, look at this image:

http://foto.pk/images/dsf.png

please help me, I uninstalled from safe mode using aswclear, and install again, but this error is never resolved.

Go to maintence / registration tab you should have a key via registration e-mail copy and paste into avast key box!

Any other antivirus on your computer before you installed avast

This is known bug that changes Avast Free to Avast Pro Trial.
Only cure is clean install with Avast Uninstall Utility.
Avast Uninstall Utility:http://www.avast.com/uninstall-utility
Avast Free 8.0.1483:http://www.filehippo.com/download_avast_antivirus/