Mac Specs: Black MacBook- 2.2GHz, 1gb RAM, 160GB, Double-Layer Superdrive.
Yes you can first off, go to your windows firewall and uncheck "don't allow exceptions" than, on your mac press ⌘+option+esc, than from that window relaunch the finder. If you still do not see your windows PC follow my next step.
Go to system preferences than Network than click advanced and go to the wins tab. From there add you mac to your windows work group. Relaunch the finder again and you should see your windows PC.