can t open folders share

I've shared the CD drive on a Xp box. From the Vista machine I can open open the Shared CD drive and access documents at the root level. If i try to poen a folder on the CD drive I get a message stating that the folder is not accessible. Both boxes are on a Windows Domain and I've logged onto both boxes with the same Domain account. I've added the account to the Share permissions with full access. Any ideas what the problem may be?