Windows 7: Wierd wireless problem

Hey guys, i just had an ISP install a wireless connection at home and i seem to have a troublesome problem with my windows (Windows 7 64x).

I checked out the "slow wifi connection" threads but that wasn't it... the problem's like this... it's like it can only support one connection at a time, as stupid as it sounds, if i use the browser and only the browser it works fine, if i use utorrent the browser (or any other internet application) won't work... the same works with MMOs.. if i play windowed and open the browser there are good chances for it to work but the game will disconnect and won't connect unless i stop using it or any other stuff using the internet... i wish i knew more or explain this better.. i had other friends comming to my place with windows xp and that didn't have any problem... if anyone knows how to fix this please help.
I use a Dell Studio XPS 1640

You had someone installed it for you, is it? Why did they not test it out before the leave?

It looks like it could be a driver issue, have you made sure you got the latest driver installed?

Yes, they sent a team over to install it (they weren't very bright, very straight forward in what they knew) and i tested it out... the internet speed and everything was ok but i did not test more stuff in the same time to see this problem.
About the drivers, the ones for the notebook are up to date, although i don't about the wireless adapter (Cisco EPC2425).
IF the adapter might be having problems, some tips about would be great... but it's unlikely, i mean, it worked great on a notebook with xp on it .
I'd be glad to use xp but my model of laptop doesn't have any drivers for it on the official site and i wouldn't go with trial n' error drivers... oh yeah.. and none for video (Ati Mobility Radeon 3670).
But i'd like to solve this and still use Windows 7, this is my only issue with it...

do you have multiple computers in your home connecting to this? It might be that one is connecting through G and your failing comp is using N and cant use G. The wireless router might be switching to G for one computer and then back to N for the other. ???

I wish it were so but no.. this is the only one using it..

Some things to post in this thread so people can help you resolve this:


Cable Modem/Wireless Router brand and model number

and

Computer Hardware for connection

Wireless adapter: Cisco EPC2425

Notebook: Dell Studio XPS 1640 - Intel WiFi Link 5100

what ISP are we talking about here and what is the purchased speed level

try logging into the router and turn off the internal firewall

The IPS is UPC (in Romania) through tv cable....

About the logging in the adapter and turning off the internal firewall, i'm no pc noob but i never done that before... if anyone could explain how, i'd gladly do it .

open a browser window and in the address bar type 192.168.1.1 and hit enter when the login window comes up leave user name and password blank and hit ok if that doea not work leave user name blank and use admin on the password line