If you can’t see your Windows 7 VM from Mac OS X in bridged mode, the problem could be the location set on your Windows 7 OS. It’s possible that with bridged mode, Windows can’t figure out the network time and default to ‘Unidentified network’ which is the same as if you chose Public and put it into a safer mode than if you chose Home or Work. Unfortunately if it were the case, you can’t really change the network type. If your VM is going to stay home and never wonder into the dangerous wildland, you can just set the ‘Unidentified network’ to be treated as a private network via:
Start -> secpol.msc
Network List Manager Policies -> Unidentified Networks
Then you’re done!