That's odd, then your ISP provider declares that everything you upload & download = total upload ?
That's also strange that your uploads should be identical to your downloads. Have you checked your Monitor window to see if they are uploading the identical files you have the same day?

Something else, LW's menu Tools>Options>Uploads>Basic & untick or make sure that Partial Filesharing is not ticked & press the Apply button. (I suppose also turn speed to minimum.) You did press the Apply button after all those changes you made above didn't you? Always press the Apply button after making any changes to Option settings.
Also go to Tools>Options>Advanced>Preferencing & type in 9000000 in the option box for how many files must share not to be a freeloader. Press Apply.

Oh I should have mentioned that if you are in front of the computer whilst this is happening, then move the files you have finished downlding into another location on your computer or an external storage device.

I don't quite understand how this could be happening. Sounds very suspicious. May I recommend you get yourself some tools:

1. A reliable anti-virus program

2. ad-ware http://www.lavasoftusa.com/software/adaware/ (FREE)

3. Spybot - Search & Destroy http://www.safer-networking.org/en/mirrors/index.html (FREE)

4. Peerguardian: http://peerguardian.methlabs.org/pg2.html (FREE)