It depends on what they mean by 'not allowing' filesharing...
But, one quite good way to get music that you pay a small amount of money for is to use
Musicmatch Jukebox and their new service...
There is a link for that in my 'sig' below...
There is also
iTUNES...
It would be nice for you and all if you could AVOID using Napster2
But, best would be for you to see if you can resolve the 'problems' with your ISP... Either through the 'front door' or...
The back !