Gnutella for movies? You're joking, right? Don't get me wrong. If I didn't use Gnutella, I wouldn't be here. (and Shareaza is a damn fine client) but for movies...try Direct Connect. Get the original software here:
http://www.neo-modus.com/
another version, but not all hubs accept DC++:
http://dcplusplus.sourceforge.net/
Many require HUGE amounts of files to be shared. Not all of them, though. These hubs are run by individuals - and they make the rules.Most are not a place for freeloaders or people sharing kiddie porn. Abide by their rules and you will be OK.....

Another thought...if your computer is misbehaving with so many apps. I'm wondering when was the last time you did some basic maintenance (scandisk/defrag) and have you used Adaware lately to check for scumware? Sorry, too lazy to go grab a link. Search google and you will find it.