Counter-Strike Source, Server Issues

System Specs:
AMD Athlon 64-bit 3000+ Processor
1GB of RAM
Radeon ATI X700 Pro Graphics Card
Windows XP OS, up to date
Wireless Roadrunner ISP [Via USB hub antenne]
Drivers and all are up to date

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Okay, so, here's my problem.

I have CS:S installed and updated, I also have DoD:S, however when I attempt to access servers my list contains around eight. It should contain several hundred, or better. When I attempt to access one of those eight servers, the loading bar stops at "Parsing Game Info..." and will go no farther. I let it 'parse' for three hours once. The thing that boggles me is that when I create a server it stops at "Establishing Connection to Server..."

Now, I run other games and Mozilla just fine. I play(ed) World of WarCraft, Warhammer 40k: Dawn of War, Guilds Wars and some others. All of which ran fine. I did have some similar trouble with Battlefield 2 as well, however, the game doesn't really appeal to me, so I didn't fight with it a lot.

I have reformatted my PC a few times and it makes no difference. Though, I have run CS:S with this same PC, same router and same modem before. It just randomly stopped. I really cannot find a specific incident that could've caused it.

A couple more things. One day, just randomly, DoD:S worked fine. I managed to join about three servers, like I normally should be able to, and then it went back to its broken state. I've also tried connecting to the router via ethernet cable. Originally, it worked, however, I recently bought a long enough cable to reach from the router to my room and it behaved just as the wireless.

If some one could help me find a solution that would allow me to play CS:S, I'd be greatly in debt to them.