Xp Spyware Virus (unable to fix)

I'm not quite sure if this problem has been answered before but I've been searching for a solution and all seems to not work. All the solutions people are giving involve internet connection to download a certain site that does virus scans or deletes the problem permanently (so i believe) but I am unable to use these. Reason Being is this let me start from the beginning.

1)So I started trying to use a virus scan of Norton 2010 and a few others. Each time I go in for another scan more Trojan viruses appear and keep coming back. It changed my background and starts coming up with all these alerts and warnings saying my system is infected and no doubt it is.
The Norton scan says I need to restart my computer in order for it to take full affect. And so I do so, but strangely when logging off it takes longer then it should. So I turned Off my computer compleatly and waited a few seconds until I restarted.
2) When trying to log back in It automatically signs me back out.
3) I went into safe mode networking connection
4)Logged in as administrator and I'm finally able to get into my computer without it logging me off. (This is the only way I can access my computer. But not all things work when using like the internet my main resource to get rid of this.)
5) Yes I have tried numerous of times trying to access the internet threw that computer but nothing works even when it is meant to be connected.

When I went to another computer to find out solutions I read that Norton Does not pick up the problem of the virus(es) (Which what I believe is the cause of why I cannot log back in.) So I cannot access internet threw administrator to fix my problem which I need.
Its out of my knowledge what else to do, I would like to go to someone to help me fix this but I simply do not have the money for. To me there are very important documents in there that i cannot afford to lose.
Sorry for the lengthy talk but I'm just trying to show a full understanding of my problem.