HiPaul,
Today I had thesame problem as youare reporting. The installationwas done withan administratoruserandwas stillgivingthe same problem.
The solutionto my problemwasuninstallingallSAPGui7.30 components and re-launchthe installationagainbut this timeright click over sapguisetup.exe and select "runas administrator" and installationcompleted successfullyand I couldstartwithout the problemsthat will appearto you.
Regards,
Gabriel