Downgrade to Windows XP. Never use a Windows release in the first year it is out unless you wanna figure out all the bugs and be the guinea pig for hackers. Nothing will be compatible for Windows 7 the first year it is out anyway.
Smash is right the bottleneck is not your CPU, it rarely is even though people who don't understand much about PCs always point to this (or the video card.)
Most often overlooked is the bus speed on your motherboard which controls how fast devices such as your memory, CPU, and video card can communicate with each other. On most PCs this is your limiting factor. Your motherboard CPU combo look fine, but do you know what type (speed, not brand) of memory you are using?
Your problem most likely is software related. Downgrade to XP and/or kill unnecessary background programs that are hogging up system resources. Haven't used Vista much myself, but you should be able to gear your PC for performance somewhere in the system properties. Also make sure you don't have any worms, viruses, etc...
Solrain - Taru Red Mage
"The answers are abundant, the questions aren't so clear."
"To all the sleepers: the legions of tacit, unquestioning, smug, bored, trapped, cynical, suffocating sleepers ...wake the **** up!" - A Dreamer
"I sincerely believe the banking institutions having the issuing power of money are more dangerous to liberty than standing armies." -Thomas Jefferson