Shortly after installation I get stop error 0x0000000A Then the error goes away after uninstalling Avast.
I have use the free version for many years and due to a root kit infection I decided to purchase the pro version and I can not seem to use it.
are you sure the computer is clean ?
Follow the guide here and attach logs form Malwarebytes quick scan / OTL / aswMBR
http://forum.avast.com/index.php?topic=53253.0
one of the removal specialists will check the log to see if you are clean