Seriously, I understand fully what is wanted, getting one is another thing.
Unfortunately Chrissie has got herself some nasties, how many we don't know. What the (cough, cough) support people at Grisoft don't understand is how knowledgeable Chrissie is. Without being rude, you could put that knowledge on the stamp on the post card.
It is in the interest of any company that provides an antivirus service that they find out what the virus/trojan is on Chrissie's computer, so they can take action against it.
Now unless Grisoft or any other support staff are prepared to give clear instructions to Chrissie then both ends are on a loser.
My advice to you Chrissie is to take your PC to a reputable repairers and pay for them to rid you of the nasties that you have. Otherwise I can see you getting more and more frustrated with this. There is no easy way round for you that I can see.
All the applications mentioned so far are good, well used by the individuals that recommend them. However, if you put any of the AV programmes in your computer as it is now will be wasting your time and money. Get it cleared of any nasties and then put in another AV programme.
I have my serious caring head on at the moment.
Colin No.2