Wireless LAN works great one direction, but not the other

Hi all,

Have my desktop and laptop connected via a USR wireless router and card.
Have ran XP home network setup on both computers. Have used the same network
name and flagged folders on both machines for sharing. I can access the
laptop files via the desktop and they download / execute very fast, but I'm
having problems accessing the desktop files from the laptop. I can usually
see the desktop files and folders via the laptop if there isn't many files
in them, but they never download or execute. Seems like transfers from the
desktop to laptop are moving very slow and "hang", but transfers from the
laptop to desktop work great.

Any suggestions?

Thanks,
TR