Mountain lion: unable to turn on wifi

Got a tricky problem on my MacBook Pro. A while ago I started losing my internet connection while surfing, so I tried resetting my wifi by turning it off and on. For some reason, I can't turn it back on. When I reboot my system, internet works perfectly for a while, then suddenly stops. It doesn't shut down, but I can't find any networks in the list.
I took it to my local Mac Store, and they deleted the system prefereces files, but it didn't fix the problem. I also reinstalled the entire OS, and I did so by formatting the hard drive and installing Snow Leopard directly from the CD that came with the computer. Then I patched up to Mountain Lion, but it didn't fix it either.
I don't know if it's a hardware error. I mean, it works fine just after rebooting the system, but the problem should have disappeared by reinstalling the OS. They can't help me down at the mac store, and I refuse paying 500 Swedish crowns for a single phone call to Apple Support. I'm running out of options here, please help me!

To OP: i have been having this problem for months now. I have been able to fix it temporarily by many methods, but it keeps happening again. Sometimes it will be fine for five minutes and sometimes several days, but always the problem repeats. I am now thinking it is the network card or the antenna. I will keep you updated. Let me know if you've had any luck.
Here is what I have tried, in various combinations:
Reboot computer
Connect to a different network
Hardware reset: shut down computer, then press and hold power button until white LED on front edge of computer flashes rapidly, then release power button
Pram reset: restart while holding command option p r at the same time until start up tone plays
Erase configuration file: Finder menu: Go: go to folder: type in /library/preferences/SystemConfiguration: hit enter, drag systemconfiguration folder into trash: enter admin password at prompt: restart computer
Create new location and delete existing: System Preferences: Network: Location: Edit locations...: add new location with + button: remove existing location with - button: restart computer
Set service order: : System Preferences: Network: choose gear drop down menu icon below connection list window at right: set service order: drag wifi to top of list: restart computer
clean reinstall of operating system - format disk and reinstall from scratch

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