help with Wireless/ethernet router filesharing?

Hi there, I'm currently trying to share a portable hard drive attached to my laptop (With Vista ) (320gb, LaCie, not sure what exact model) across a wireless network to a computer (with XP) that is connected to the wireless router via Ethernet Cable. Is this even possible? If so, there seems to be a problem either sharing the drive over the network (the computer it's attached to is able to recognise it as a networked drive), or with the network itself (the ethernet cable'd computer, when searching "Entire Network" in windows returns an error when searching in the workgroup "WORKGROUP" (the workgroup of both computers). Thanks a lot for your help, and sorry if this is in the wrong place

Unfortunately, that's not the problem, it (the wireless-connected laptop) never recognises any other computers
even in the first place. I would just like to know if it's possible to share files from a computer connected wirelessly to a router to a computer connected to the same router via wiring. Thanks a lot for your help anyway

Yes; that's exactly what I do here.

Note that even if you give read access to everyone you probably need to ensure that you have the same accounts on both machines with the same passwords; my Windows 98 machine couldn't see the files on the XP machines until I discovered that and created the appropriate login.

Have your got any third party firewalls or network monitoring software running on any of the PCs in question? If you have try temporarily turning them off and seeing if this resolves any issues.