Since I've installed F10, I've been able to use the internet via my wireless network...

Last night, I installed VirutalBox on it and for some reason, the VirtualMachine along with the Host (my Fedora 10) completely locked up, and the ONLY solution was to do a hard shutdown.

I booted back up, and my wlan0 interface was deactivated...and it won't show up in my network manager (let alone show all the wireless networks).

THIS WORKED BEFORE LAST NIGHT! any idea of what to do?

Hi, what card do you have?Which driver does it use? Try unloading and reloading the module, and look in dmesg for any errors it might report. If it loads a firmware, chances are that it got stuck in the card's memory (or something like that, in any case what I'm describing worked for me once). The best solution to that is to cut all power to your box for a few minutes, that should clear out the firmware. Another possibility is that your device got renamed, check with iwconfig (I admit that networkmanager should see through this though).