are all 3 computers running xp????sounds like you have some funky group policy settings in place...
NOTE: you must be a administrator to perform the next function. if you dont have a admin account, then you can use something like UBCD to create one - www.ultimatebootcd.com
left click on start>run
type "secpol.msc"> now be careful in here, because this is where you can lock yourself out of some much-needed things
in the lefthand payne, expand "local policies", then left click on "securtiy options"
have a browse round there, and the other sections in "local policies" and "account policies"....
EDIT:another way to have acces (again, you need to know the details of a/the admin account) is to use cmd.
left click on start>run type "cmd" wihout quotes
type: net use \\computer\c$ /user:administrator password (/persistent:yes)
computer\c$ = computername, and share if u wish.
/user = a admin account
password = password for that account
persistent = if the connection is persistent
Edited by 4ward_tristan, 06 November 2007 - 09:23 PM.