TCP/IP home networking tutorial

I have 2 computers on D-Link wireless router. Internet OK, sharing not so much. I followed this tutorial to a letter and got each computer to see the other, however when trying to open shared computer, "...not accessible, you may not have permission ...."
I dont have Zone Alarm and I disabled Windows firewall.

Could anyone help please?

Left click My Computer, right click C: drive, left click on Sharing & Security, follow instructions and tell it to share drive. This is for the computer you are trying to access. It will take some time for it to read and mark to share all the files and folders, so have patience. Afterit is done, the C: drive icon should show a hand open holding it to show it can be shared.

I did everything according to the Tutorial to link my two hard wired network of two Windows XP computers together so I could share files and a printer. I kept getting error messages saying things like,

blah blah blah "is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permssions".

I disabled the built in Windows XP firewalls to no avail, tried renaming my network, all sorts of things to no avail. I checked the internet and got all kinds of difficult answers, none of which worked. My techie friends suggested setting up pa$$words for all users, making sure the pa$$words and users matched on both pc's, and NOTHING WORKED.

I then checked my firewalls. One PC is protected by Mcaffee the other by PC-Cillin. I had to adjust the firewalls to allow the PC's to access each other and share.

So...if you are having this problem first check your firewall logs. If the firewall log is showing it rejected the other pc, then that is your problem. Each firewall software program is a little different, but you have to go in and adjust the firewall so that the firewall allows the other computer to "talk" to the other one.