Access Denied to WindowsXP Share, Why?

Hi,

I recently made a RAID 0 array of my D: and E: drives so that I now
just have D:

Since doing that, creating shares on the D: drive does not work. I can
share folders OK (or so it seems)... they can been seen when browsing
my computer from a local network via Workgroup computers, but they
cannot be accessed. An "Access Denied" error is displayed after a short
pause.

Sharing/Accessing folders on my C: drive works fine.

I have turned-off Simple File Sharing and compared permissions between
C: and D: and they seem to match.

Can anyone help me solve this problem?

Thanks in advance,
Matt