Networking question?

I've got a Powerbook G3 333mhz running os-x and a PC running win 98. I got a hub to connect the two with ethernet. I can see both computers but when I'm on my pc after opening network neighborhood I can see my mac but when I try to open it it says enter password and it has my computers shortname for the user name. I tried to enter my password (the one I use for everything)and it says it's incorrect and says that the computer does not allow remote access. I can get stuff from my pc onto my mac from the mac. I can't put anything on the pc from the mac though. It starts the copy status bar and runs all the way through and then it stops like it is done copying and then it doesn't show up on my PC. Does anyone have any ideas on what I need to do. I'm not to experienced with networking. Thanks in advance. Brent.