Sorry I can't help, but any information is better than no information.

I had that sort of thing once.
And it worried me because I only can have about 30 Meg per day rations or I get slugged a hefty bill for excess usage.

I got by for a few days by getting my page I needed, then going Offline, read or do what I had to do, then go back Online.
Then go the Page or whatever I had to do, then go Offline.
Lot of mucking around.

It turned out that some website was causing me to upload Megabytes of data.
I got rid of the problem maybe by doing a system restore, but more likely by playing around with the registry.

Have a go at running msconfig and see if there is anything in your startup Folder what could be a problem.
Hijack this can often find the problem too.

Google searches give good results if you can actually insert the correct keywords to use.
But Googling is gonna eat up your Megabytes while your virus is still alive.

I've had so much bullaaaa over the years, and I managed to get rid of them, but my memory is terrible and I can't recall any repairs and if I get caught again, I'll be no better off than I was when I got caught the first time.

Good Luck with it.

You could always get another cheap Computer and use it until you get the information to repair your faulty one.
That is what I do now.
Have a spare Computer for times like these.