OL,
Do not despair. Now we have to undue most of what was done before beginning again, but I do not see from the log that anything insurmountable was performed to the system.
Brainbuster bot only crippled Avast from functioning. This is correctable. Ashmaisv was apparently not removed and thus will continue to appear in the Startup but this also can be fixed.
IM me with the name of the other AV....Urrrrrr :'( and I will see if I can get the uninstall utility for you or at least see if it can be safely removed without it.
Other recommendations would have been made had you asked for an alternative AV .
Ok, if you installed SP2 after the problem, then there is little change of restoration, but I still would check the System Restore to see if any Restore points were retained. I am not sure what files are overwritten by SP2.
It does replace the Windows FW with the newer Security Console, but I am not sure if the System Restore is updated or modified. Check it anyway. What can you loose?
Our goal here is the remove all AVs present on the system completely.
Then we can carefully install Avast Home.
Once this is done, the Usiskin error should be gone, but if not, it is usually a small change to the Avast ini file that needs to be made.
If you go into Start/Run and type MSConfig, it brings up the Startup menu. Open the Tab Startup. Go down the checkboxes for Ashmaisv and uncheck it. Click Apply, then Ok. System should ask for reboot. Reboot.
Ashmaisv will still be in the drive, but will not load on startup. It will be removed later on with the Avast Uninstall Utility.
Let me know when you are ready to proceed.
and you can do anything you put your mind too!

I and others here will help. Follow instructions carefully and ask for clarification if you do not understand. The rest is easy.

Good luck.