okay with file sharing enabled
you will have to know the name of the machine and set up the shared folder
right click on the folder, click propertise then click sharing. click share this folder
for the share name make something easy like music or extra
then when you want to access the other computer
right click on my computer, and click map network drive
type in:
\\thecomputername\foldername
it was ask you for the account and password for that computer
enter the account name of whatever you are using on the machine that your trying to access
if you want to get into the whole c drive type
\\computername\driveletter$
ie
\\jason\C$
this will give you access to the entire drive
hope this helps some