Why isn't Avast working?

Question

Antivirus

Hello. Today began to take off Avast. Laptop, Win XP is installed (it takes a long time to explain why, you need it, there is some specific software that only works on it). Tried reinstalling several times - didn't help. Those. I just click on the icon, trying to start - it does not start. When Windows starts, it appears in the tray for 7 seconds and crashes.

Answer 1

To tech support.