Wireless Networking Problem

[No.1]

So i took the plunge.... i bought a wireless router.

It has one wired PC to it, and a wireless laptop at the moment. The net works fine on both of them, but i want to set up file sharing etc... on them, by creating a workgroup.

I have this problem though, when i try to access the laptop from the PC

[img=http://i136.exs.cx/img136/1403/screen17tr.th.jpg]

How do i get permission to use the source???

PS.... i'm a bit of a n00b, so please make it easy to understand.

Thanks guys