laptop will access homegrop but will not allow access to mapped folder

Righteo, i have my (main) desktop hooked up with mapped folders which my two other computers (laptop wireless and wired and desktop wired) can access and do what i intended them to with sharing restrictions, etc.

However, my 2nd laptop that after a struggle connecting it to the homegroup will not allow access to any mapper folders keeps popping up with a login screen for THAT laptop, and my others will not connect to it properly.

any ideas where the problem lies??

Have a look at this Microsoft article, which describes how to set up a Homegroup.

HomeGroup from start to finish - Help & How-to - Microsoft Windows

Just remember that a Homegroup should be used when all your computers on the network have Windows 7 installed.

If they don't you need to be using a Workgroup.

homegroup is setup and functional on the other 3. i am having trouble getting the 4th to register mapped drives and the others to register this ONE laptop