Windows what am i missing here (XP file sharing)

[TechnoScream]

i have around 5 PCs in one workgroup. I want to move on from simple file sharing to have more control over who can read and who has full access to my shared folders.

i thought this would work:

on my main PC I created a copy of my dads profile (same name&pass)
shared a folder, and in permissions chose his user and gave him read access.
Also added him on the security tab.
removed the everybody group

if he tries to connect from his PC he gets the "\\computer\folder not accessible access denied" message.

If I leave the everyone group there, then he can access it fine.
i notice that when i add him within permissions its litsed as

\\my computer\his user

...should it be

\\his computer\\his user

..is that even possible?

can you see what im missing? (I admit this is new to me!)

Thanks in advance

*Edit*
I've realised its something to do with my dads profile, If I creat another profile on his PC and then on min it works fine. any ideas on how to rectify this? (I dont want to delted his user and lose his stuff)
Thanks

[kaujazz]

read this and this and this

that helped me