From reading this forum it seems lots of people have problems with PCGuard.
What is even more disturbing is that it seems not to uninstall completely without using a separate removal tool.
That, in itself, is not unusual as both Norton and Mcafee require the use of such a tool. However a removal tool for Norton or Mcafee is freely available while a removal tool for PCGuard is not. To get and use the PCGuard removal tool, apparently, needs the assistance of VM tech support.
My opinion is to give this wretched software a wide berth. There is plenty of free av and/or firewalls out there that mostly behave themself. None of which, to my knowledge, require a removal tool to clean up after uninstalling.
Strangely I run Free AVG on an XP desktop and have never had a problem with it. I run the paid for NOD32 on a Vista notebook and it has some seemingly insurmoutable gliches such as on-demand scans always stop at 89% and at the same folder. The laugh is the folder is empty. I have had to set it to ignore that particular folder. Another gliche is now and again it doesn't start up correctly saying a driver hasn't installed. So far a reboot fixes this one.
Maybe the free alternative is a better alternative. I'll be dumping NOD32 when the subscription runs out.