cannot access the computers in the same work group

hi all

i find out my problem on one machine ie windows 2000 professional “computer browser service was disabled ” i enable it and now i can see computers from both computers
i can see the contents of computer B from computer A but cannot access them it says me to enter the network password which i dont know, while the computerB can see that computer A is on the network but when i click it to aceess the shared resourse
it gives me a message that “no permissons to access the resource” .
now i want to ask u a question that is the network password is same for both computers or differen, i know this question is silly as i think that the network password is for one network, can both computers can change it if yes is there any way so that i can reset them or change them.

i apprerciate your help to resolve this headache

thank you

noble