Maybe your wifi card already fried a.k.a already not working. Those symptoms you described also point to dead wifi card.
This usually happen to laptop a lot so might consider buying an external wifi dongle for your laptop.
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You can't... If your wifi card is already broken, those annoying popups will not disappear just like that. You have to disable your wifi driver, not uninstall it. Only then those popups will not bother you again soon.
As for reinstallation for win7 question... I'm afraid you have to reinstall everything back. Even if you choose to install Win7 without formatting the partition, programs installed will be unaccessible due to change in registry but your documents will not be override or mising during the reinstall...
I'm not sure if you try to copy registry before install and reapply it back on new win7 install would actually work but it might do able to run your programs as normal except for the missing shortcuts...
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