The device we are now using for Windows-7 tests is this free RAMdisk:
http://www.cenatek.com/product_page_ramdisk_download_list.php
the one at the top "Dataram RAMDisk".

Thanks for the pointer David, downloaded a copy this morning and even though I'm using XPpro I
used your Vista setup instructions and so far its working without all the previous crashing.
The new DVBWorld box, Tellicast and MSG-DM appear to be stable now, so the acid test will be
when I switch on the system from cold in the morning :-)

Trevor