I have run Advanced System Care Professional to fix errors on the system, defrag, etc. I have also run Norton's to remove virus/malware, and I have run RegistryBooster two fix any errors in the registry. At this point I really don't know why my download speeds are so low compared to my desktop, which is a slower machine BTW. I have also checked to make sure there is no unwanted traffic on my wireless and the only clients showing up through my router's interface are the computers in my home, all of which were inactive when I ran the tests.
I also did a fresh install of Win 7 about a month ago, so there is no bloatware on my system, and things should still be rather clean and tidy.
Dual Core Pentium @ 2.0 GHz
3GB 400MHz RAM
Atheros 802.11 b/g wireless card
Linksys E1000 Router with 'N' disabled
All other computers connected physically to the router