I've got a studio1555 that has been giving me fits with wireless networking oddities.

Laptop was running vista home premium & i upgraded to win 7, as that wasn't the first vista laptop that had weird ireless problems. Right after the upgrade (custom, did fressh install on reformatted HD), it detected the wireless network min the office & connected fine. Was going through windowa updates, as well as Dell driver updates & at some point, it disconncted & couldn't connect to network. Windows troubleshoooting suggested rebooting the router & since that wasn't an option, I got out my verizon jetpack & connected to it. all worked fine for a while & then suddenly that could no loinger connect to the internet. Windows tropubleshooting suggested the same fix, but since my mac laptop was still connected to jetpack & internet was workiing fine, I thought it was something else. Got back home & once again, it found my home worked for a while & then eventually the same problem, can't connect to my wireless network! Laptop wireless is the intel wifi link 5100 AGN & I do have latest driverss from dell.

What could be the problem?