Upgraded imac to lion now can't keep connection to wireless network, iPhone and iPad are fine?????

Have upgraded my imac to lion and now it can't hold onto my wireless network connection, also having intermittant problems with mail incoming, and not able to send mail out. Wireless network, and mail working fine with my ipad and iphone.  Any ideas out there??

I actually had that problem when I was downloading Lion it would connect but then if I tried to go on safari it said no internet connection and an exclamation point would be in the wifi bar. If you click on you wifi bar click on the option that says no error no internet or something like that. I deleted my network and then reestablished it as like it was the first time has been fine since even after the upgrade. I was in panic mode when it happend to because all my other stuff worked and i just got my new imac last week

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