Oopsagain,
I have, in the meantime, struggled through the installation myself and have been able to get everything working. One of the things I learnt was that the Crystal DLL's need to be in the correct place - copy the contents of the c:\WinNT\Crystal folder to "c:\Documents and Settings\%USER%\Windows\Crystal" for each user. Also remember to do it again if you do any subsequent installations/upgrades of Crystal Reports.
Hope it helps!