Last performed operation was:spawning/bluescreen

Avast installation failed and now when I try to reinstall it as a message Last Performed operation was: spawning. What should I do now?
Now Avast removed http://www.avast.com/uninstall-utility according to the instructions and RE-installed .Re- installation will not run until the end. Blue Screen closes the machine and the installation will fail. I’ve deleted the registry information of avast and did a system recovery but nothing works.
Win7 32 sp1
And the problems continue, I emptied the old temp folders, and I got avast internet security installed. Now, after installing avast announced that the firewall module is not running and the internet does not work. The machine has no other virus software installation time. Bored soon avast program problems and move on to other anti-virus protection programs.

If you do a forum or google search you’ll find other threads where this error is discussed.

The general guidance seems to be to completely uninstall (using control panel and then the avast uninstall tool in safe mode), and then reinstall a fresh download.