Hey guys,
Thanks for the suggestions.After much talking her through the problem it is now solved.The issue first came from the fact that she actually had 3 antivirus programs installed all of which seemed to cause conflict with each other.I talked her through removing them all then had her run the Stinger app which got rid not only of mydoom but also of one called sasser or something similar.Then had her install the latest avast 4 and virus defs.All seems to be working now again.

Her PC was really going insane.So far so good though.Makes me wonder how long that pesky bugger was in there considering it's so old.

I have one final question that is somewhat unrelated but may be related to XP.I was attempting to connect to her PC via remote assistance tool in XP to help but for some reason i can not connect.She can connect to my PC perfectly fine which is what has me a bit confused.Could it be due to the fact that im using Xp pro SP2 and she is using XP home SP1?