Folder sharing issue

I think i've tried every solution I could find, but I would like you to prove me wrong. Here's the situation:
On the network, there is 1 wireless vista laptop, 1 wireless seven laptop, my wireless seven laptop, 1 xp netbook, 1 wireless media hub with an attached drive, and 1 wireless printer.

The other win7 laptop can be accessed by the other computer but not by mine and can access the other computer,but not mine. My guess is that I somehow played with settings I shouldn't had.

Here's what works or not for mine. No one can access me and I can't access anyone. The wired xp computer cannot see my shared folders, but can see the computer when I go on network/all network/microsoft windows network/mshome (or something like that, I have a french computer). The other windows 7 laptop can see me but not access files. I can see it too but not access the files. But the wired xp can access the files on the other 7. I can access the printer without any problem. Also,every media device shows on the list(the hub and shared libraries of the other 7 computer).

Now for my computer settings: Network is set at home with the following settings`: network discovery on, file and printer sharing at on, public folder at on, media streaming on, enabled 40 or 56-bit encryption, password protected off and allow homegroup managed by windows.

We all are on the mshome workgroup.

bump

anyone got a tip to start?

See if this link helps you out- Win 7 and XP File Sharing Problem - CNET Windows 7 Forums
works for me sharing directories and I was able to access them. Unfortunately it didn't work for connecting to a shared printer on Windows 7.