Steam and online gaming

Hi, I have recently rebuilt my system for gaming. and i am having some issues with online gaming. when i boot up my machine the internet connects fine and STAYS!! connected. the issue emerges at several times. and the issue is this...when i either;
1. try to download a steam (this seems to have corrected its self)
2. Play a game online (steam or otherwise)
3. play a steam game even if it's not online
my wireless dongle loses site of all networks, it essentially just witches itself off and tells me "windows could not find any networks" and i have to unplug the dongle and plug it back in to find networks again. this is only a recent problem, and it has only happened since i have rebuilt my system, it never used to happen when my machine was stock and i played WoW etc. it is very frustrating. i have tried the obviouse, reinstalling drivers, opening required ports, disabling firewall + antivirus. nothing seems to work

If you are using a dongle can I ask what company?

and does it only Disconnect from the internet when you play these games or when you browse the internet aswell? if its just the game I dont know what you can do tbh, it may just be your IP, because my computer messes up and I use one, but I play steam games but I would check that your dongle is working on sombody elses or your own laptop and try and see if its your computer or the dongle good luck