AVG 8 crashing Vista

Vista Home Premium.
Lots of problems.
Does not like Winamp (5531) on the same machine. Sometimes Winamp
kicks out AVG, sometimes AVG crashes everything while Winamp is running.
MSoft reported AVG problem and advised me to get the latest version, which
I have.

Sometimes I get a problem (without Winamp) when startup is very very slow,
leading to a desktop which is essentially crashed, or stalling where I think
I
have the logon screen but the monitor is blank.

In this last problem I switch off for a few minutes then restart normally,
and problem
does not recur within a day or so.

Anyone know if this has a virus or malware link?