Context menu problem

If I'd like to "merge", or "convert pdf files" from Windows context menu, but I get this message:

"Couldn"t find PDFCreator in your system. Please check if you have installed it."

I've uninstalled and reinstalled the PDFCreator, but the problem not repaired.

Version: PDFCreator 4.0.1
Windows 7, 64 bit

Could you please reinstall PDFCreator by following this guide and using the PDFCreator 4.0.1 "legacy setup"?

I followed the guide, make uninstall and reinstall, but the problem still for me.