Thank you all for your replies and help, I have now fixed the problem as suggested by support team, deleted all temp files, also removed any reference to reallusion in registry (trial version of iclone exchange 2, iclone 4 ex.) defrag harddrive and iClone 4 installed without a hitch.
I think the main problem was with iClone 4 ex as a couple of months ago I lost 1 of my harddrives where i had iclone content installed, so when uninstalling iclone 4 ex had a few problems, so manually removing all entries in registry helped.
Again thanks for the help and advice.
