Slow Startup But Fast Computer

I have an AMD Athlon XP 64 3700 2.2 GHZ Processor with 3GB of Ram. My computer is pretty fast, but just recently the startup has been sooo slow. i switched my log in screen to the classic with the autmatic login about two months ago and everything was fine tell about a week or two ago. When i start up my computer it will get to where its time to load the desktop and the log in dialog box will show up and it will finish and then this is where it should load all my startup programs and desktop icons, but it just loads my desktop background picture and then wait about 45 seconds to a minute and it will make the windows startup music and then wait about another minute and then it will start to load all my desktop icons and startup programs. I have tried al most everything. I have ran AVG antivirus about 10 times with updated defiinitions, ran ad-aware, ran spybot search and destory, registry mechanic, ccleaner. I have listen to other suggestions. I have gone into msconfig and removed all startup items, and even tried to remove uncessesary start up services from there as well. NOTHING works.