Supercharger problem?

There's a knocking/scraping noise coming from the supercharger - I only got the car a day ago, it wasn't doing it when I drove it then!

Anyone got any suggestions apart from "buy a new supercharger"? Apparently it had a new supercharger 17,000 miles ago.

Also, does the engine oil curculate through the supercharger? Is it worth getting some Moly Slip to put in the oil to lubricate the charger? Or doesn't it affect it?

Please help! I do love my car but it's depressing thinking there could be something major wrong with it already!