Vista - Blue screen with PowerPoint via Remote Desktop Connection

I have one computer (the host) running Windows Vista Ultimate and another
(the client) running Windows XP (SP2) Media Center Edition. The client is
connecting to the host via Remote Desktop Connection.

When I open PowerPoint 2003 over the Remote Desktop Connection, and click
the Tools menu, the host often blue screens with the following message:

win32k.sys
PAGE_FAULT_IN_NON_PAGED_AREA

or sometimes:

BAD_POOL_CALLER

Thus the Remote Desktop Connection (and anything else that was happening on
the host) is lost.

I am hoping a fix is known for this issue, since I purchased Vista Ultimate
for its Remote Desktop capability, and also for its reliability.

I will be pleaed to provide more information if required.

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