Internet connection problem is driving me crazy. Help.

[Blitz]

For whatever reason, my connection seems to drag ass when I try to direct download from a site, IE mediafire or megaupload. When I download a torrent, I can fly up to 900kb/s no problem, but if I'm trying for an album off mediafire, I'm lucky to get above 30kb/s. Happens in both Chrome and Firefox. I've tried with multiple links, sites, and files. Always seems to be the same.

I've tried resetting my router and modem, and it nothing changed. I would think it's browser-specific, but like I said, it's happening in Chrome and Firefox, and even IE. I've tried over both a wired and wireless connection, no difference. Streaming sites seem to work just fine. It's been this way for probably a month now, and it seems to be getting worse. I've tried clearing the caches in each browser, and that's also been useless. I have to figure the problem is somewhere on my computer, but I dunno what.

So yeah. No clue what's up. For the love of God, help.