Wierd connection problem

Hi everybody! This site have helped me before, but to this matter i still havent found a solution.

I have a MSI GP60 laptop. Recently (a week or two ago) my internet connection started acting out. The problem is as follows; I can surf the internet just as usual, but problems arise when i either try to;

1. Start steam. No connection can be made and it stops at the login page.
2. Download torrents. It just says "connecting to clients" forever, and nothing happens.
3. Play other non-steam games. The games can be started, but as soon as any connection to a server is being made, it gives messages like "no response from server".

This is driving me furious, as this laptop is made for gaming, and not being able to actually play anything is driving me nuts. I've tried things like port forwarding (and i think i did it properly). The routher is a Netgeat MBR1310, which is ****, but the problem is not routerside - my roomies connection is just fine, and as im typing this im in another city, and the problem still persists.

Any help and suggestions would be greatly appreciated, or i think im going to throw this hunk 'o junk out of the window. Thanks!