Help Needed Re Setting Folder "Access Permissions" For File Sharing on Home Wireless Network

I am running an 802.11b wireless network between a desktop PC
connected by cable to a Microsoft wireless access point (which is
connected to a broadband modem) and a laptop with a Microsoft wireless
PC card. Both PCs are running Windows XP Home.

After setup, both successfully share the broadband access and a
printer and My Network Places shows both PCs and the folders and files
on each that have been designated for sharing. From the laptop I can
access the desktop, can access and share files on it, and can transfer
files and data between the two. 

However, from the desktop I can't access any of the shared folders or
files on the laptop although they are displayed and listed in My
Network Places. When I try to access a folder or file I get the
Windows Explorer error message:
"\\ [name of laptop\folder] is not
accessible. You might might not have permission to use this network
resource. Contact the administrator of this server to find out if you
have access permissions. Not enough server storage is available to
process this command."
 I have plenty of space on each, 10GB on the desktop and 45GB on the
laptop. What "access permissions" and which "server"? 

Any explanations and suggestions? TIA

 http://www.**--****.com/ 
Catalog=LCID%3D1033%26CDID%3DEN-US-KB%26PRODLISTSRC%
3DON&withinResults=&QuerySource=gASr_Query&Product=winxp&Q
ueryc=You+might+might+not+have+permission+to+use+this+netw
ork&Query=You+might+might+not+have+permission+to+use+this+
network&KeywordType=ANY&maxResults=25&Titles=false&numDays
=&FR=1
Peruse through this.  Too many possibilities here.


desktop PC
(which is
Microsoft wireless
access and a
folders and files
laptop I can
and can transfer
shared folders or
listed in My
get the
this network
find out if you
available to
45GB on the