Wow.. 250 processes running, no wonder you have a slow PC. No, that is REALLY abnormal. I have around 19, and that is too many.
1: Uninstall everything you dont need.. BE RUTHLESS..
2: Run 'MSCONFIG', and disable anything on startup that looks useless. Don't worry, you can re-enable it if something important stops working.
3: You probably need SDRAM on a system with this speed of processor, however if not sure, its probably worth your while taking your base unit into a 'friendly' supplier for accurate ID. Memory is still pretty cheap at present.