Networking problems+Connecting wirelessly 2 Laptops

Hi,
I am pretty stuck with this one so any help will be appreciated.I've setup the 2 laptops to see each other fine (printing,internet) but although from one (name it A) of them I can access and share everything all the time, from the other (B) I can only access him and move files when I do the following procedure:

Control Panel
Administative Tools
Local Policy
User Rights Assingment
Access this computer from Network....................Guest, .....

and then I go and include on the settings there Guest or whatever and everything works fine.As soon as I restart B the settings reset (probably) and I have to do that all over again in order to gain access to it.When B restarts there is nothing on the Access this computer from Network, on the right is blank.

Is there anyway to "convince" B to save the settings in order to be able to work properly???

thanks
Marios