hi i carnt seem to be able to get my network working

basicaly i have set up 2 pcs slapped a networkcable between then and then run the network wizard thingy both computers can now see each other i.e. if i go threw entire network the other is listed there but if i click on it it says i dont have the privledges and then i hough what about sharing the c drive on both (this is the disk they boot off though?) and i carnt map it as a network drive eventhough i have given it a different name to the normal can anyone help?
thanks for any help
cyaz
aj