I had that problem to. I'm now down to 43 processes at idle. I erased almost everything not of importance. I just got restore disks for free from dell, search the site and you could find out how to get them!
I am also debating on putting the M90 LCD Lid on because I don't want my laptop to read XPS when it really isn't. If you know where to find the M90 LCD Lid, please help me out. Thanks again!