Maybe check out your process list (taskmanager) and see if there are any hidden processes running that are NOT PROPERTY OF "SYSTEM". You mostly can just click "Stop process" (or similar) to free some RAM (and the CPU load) the process occupied. If it´s more than a few processes, maybe it might help a bit.
If you don´t want to do all that manually, you can go and search for a program to do this process-list cleaning for you.
Or (well, it´s a bit of self-advertisement) use TK2, available here:
http://mgelbmann.jim...on/taskkiller2/ (yeah, it´s my Homepage, and the program is by me). You can set up an external ASCII file where the names of the processes / Tasks to be "killed" are specifies, that are then read into the program and killed. Works only on Windows (XP onwards) though...
I explicitly wrote this program for that purpose, cleaning out RAM and CPU load, and it works for me.
Cheers, Markus