Can't see files on shared network computer - help...

I have an iMac with OS 10.6.3 and am using a Linksys router. I cannot connect wirelessly to it (another issue), but I am hardwired via an Ethernet connection. My PC netbook is connected wirelessly to the router. Via Finder, I see the name of my PC, but I cannot view any of the shared files. File Sharing is turned on. Is there anything I should be checking on the Mac to be able to do this? thx.