My Macbook Air does not show up on my network to any of my other computers, Other computers on my network appear and disappear, some shared folders are not accessible

My Macbook Air with Lion does not show up on my network to any of my other computers (PC's) , even though it is connected to my wifi and does access the Internet. In addition, my other computers sometimes show up in Finder and sometimes they're not there. Sometimes they do show in Finder and when I click on them, I get "Connection Failed", other times, they connect. Also some shared folders on those other computers, which are PC's are not accessible, even though fully shared. My network is Apple Airport Extreme and works perfectly otherwise, including all PC's being able to see each other. Help would be much appreciated

I got the same problem. I want to access my shared folder on my home windows7 from my MBA. Tried many suggestions on the web but all to no avail. I thought that should be very trivial. Maybe a Lion bug?

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