MacBook :: Black MacBook Slow After StartUp Disk Got Full

I'm writing this thread on my dad's netbook bc my MacBook is so slow it took about 3 minutes opening Chrome, 2 minutes to get to MacRumors, forgot my password had to open Word, which I gave up on opening after about 5 minutes of spinning beach ball.

Booting takes about 10 minutes. Finder takes forever. Even moving the mouse over the dock to bring it up makes the computer freeze for at least 30 seconds, if not indefinitely.

The problem started two days ago. I was installing a new Windows XP program via Parallels, and somehow ran out of Startup Disk space. (I've been ripping my DVDs onto an external HD and sometimes I have up to 50+ gb before I get around to transferring to the external.)

When the "Startup Disk Almost Full" warning came up, I immediately erased 20 gb of space and emptied the trash. But everything was still stuck. So I closed out Parallels, rebooted (had to do a hard reboot), waited for the fifteen minute startup, and everything's been painfully slow since.

Activity Monitor says I'm using 1.82 gb RAM of a total 3.0, CPU is 79% idle, when I open Chrome, or anything really, I get the "Not Responding" beach ball, but no % of CPU working on the task, no increase in RAM, nada.

I have the black macbook, 2.16 GHz, 3 GB RAM, latest version of OSX