One problem is you are overloaded with security, probably some of which are inconflict with each other, and are certainly part of the slowdown. I see elements of
AVG Free
McAfee
Panda ActiveScan
Spyware Guard (get rid of that)
Symantec
Trend Micro
Windows Defender
and whatever MSN and Hotmail are trying to make you use.
Get rid of McAfee, Panda , Spyware Guard, Symantec, and Trend Micro (they don't play nice together) unless you have long subscriptions already paid... in which case, get rid of AVG Free.
If you are going to use AVG, also include AVG Antispyware and AVG Rootkit.
Keep Windows Defender.
Then replace spyware Guard with something good, like Spyware Doctor, ZapZilla, Spyware Sweeper, etc.
Rethink all your security stuff, or suffer the slow speeds.