Help QUICK please - Windows & Mac File Sharing problem

I was trying to setup file transfer from pc to my mac and i kind got it to work using file sharing etc....but i dont quite know what i did fully. i turned on the folder i want to share in windows then accessed it via finder>network on mac. but it turns out the windows laptop now has full access to my folders>files!

i only wanted to share one folder or 'public or sharing' folders but ending up in this situation.

anyway, how do i STOP sharing ALL MY FOLDERS & FILES on my home network with other people?

At the moment i can log into my bros laptop and goto network places and my powerbook appears with access to all my files and folders!

I turned off personal file sharing and windows sharing but my bro's windows laptop can still access my files and folders via network places - anyone know why this isnt turning off?

I need to turn it off before my bro comes how from work...

 

i did this even before your post and it didnt work.

then i reboot the router and it stop giving access, but now its allowing access again!!!

yes, i think my password is stored on pc. i suppose i could change my username password on my powerbook... see if that works...

anyone else on why its not a simple procedure turning this on and off via preferences?

 

ok, i realised you need to log the powerbook off the network (airport off/on) before the new sharing preferences takes affect.

But having just changed the password on my powerbook when i do switch the windows sharing On, the pc it cant access the powerbook, and the network places page 'stops responding' & crashes trying to work out why its password is not working.

so now i need to know how to delete the old password from the pc laptop, just for future reference.

anyone?

and i want to share just one folder (public) without broadcasting my password?