Windows 7: XP Drive Visible Can't Access Shared Folder Secpol inop on Win7 laptop

I have an old XP sp3 system that I want to share a folder on to the rest of the family. (Poor man's server).

My own Laptop is an ASUS with Win 7 Home Premium x64 (has gpedit and secpol working) I can see/access the Computer/Drive, Shared Folder and Files OK

My Netbook is running Windows 7 Ultimate x86 and can also see/access the XP computer/drive, shared folder and files fine.

My wife's Laptop, a Samsung, running Windows 7 Home Premium, did not have gpedit or secpol installed.

I was able to copy gpedit and its support files from my ASUS to the Samsung and I can work Group Edit (from Run... Still does not appear in mmc?)

I have been unable to get Secpol working and I suspect that it is the reason I cannot access the WinXP shared folder or files

I can see the Computer/Drive and Shared folder but cannot access it.

Do any of you have any ideas, other than buying a Windows 7 Upgrade or new computer?

I am also having a Problem with my daughters laptop, but it is running VISTA...

But with two versions of Windows 7 accessing without problems I doubt the problem lies in the XP system...

Thanks