I cannot install Corel videoStudio x4. why?

before it works very well. since i uninstall and install again, it fails during the installation. it says : " INSTALLATION WIZARD NOT COMPLETED. YOUR SYSTEM HAS NOT BEEN MODIFIED. TO COMPLETE INSTALLATION AT ANOTHER TIME, PLEASE RUN SETUP AGAIN. " I run anti virus, regCure and same results. INSTALLATION... show more before it works very well. since i uninstall and install again, it fails during the installation. it says : " INSTALLATION WIZARD NOT COMPLETED. YOUR SYSTEM HAS NOT BEEN MODIFIED. TO COMPLETE INSTALLATION AT ANOTHER TIME, PLEASE RUN SETUP AGAIN. " I run anti virus, regCure and same results. INSTALLATION WIZARD NOT COMPLETED.

need your help please. thanks

im using win 7 ultimate.
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