I was wondering if anyone could help me in regards to a problem that I have?

The problem is that I am getting quite a few windows crashes - the dreaded Blue Screen Of Death.

I am running Windows XP and have made a few system changes recently. I have upgraded my firewall from ZoneAlarm freeware version to the ZoneAlarm Pro version. Also, I have upgraded my AV system from Norton 2002 to Eset NOD32. Could this be the cause of my woes? Other than those changes, nothing else has been touched. I am really stuck with this. It has only been happening recently and as I said, I have absolutely no idea WTF is going on. I have patched my system from the recent virus attacks and regularly run AV to check for nasties.

Please....... HELP!

ANY help would be greatly appreciated. Thanks in advance.