Cant get desktop to access laptop

Hi everyone

I have a desktop and laptop both connected wirelessly to a
billion 7500 wireless router and ADSL modem. I have run network setup wizard
on both machines and enabled file sharing and printer sharing and enabled
folders to be shared,

When i view my workgroup computers both the desktop and
laptop are displayed. However using my laptop i can access my desktop. But
when on my desktop i try to access my laptop it says that i do not have
access to this laptop and that i should check with my administrator ( iam
running in administrator mode). So i dont know what i have not enabled on my
laptop. On both computers i am using windows xp and SP2. (laptop using
professional) and i am letting windows control my wireless connection

would appreciate some help from out there