No preview of CDR files in Windows 7.

I have 64 bit windows 7 home premium sp1, CorelDRAW graphics suite x5. I bought coreldraw graphics suite x7 and it was so buggy I uninstalled it and went back to x5. I uninstalled the x7 shell and reinstalled the x5 shell. I also did a repair and after downloading and installing the two updates for x5 I now have thumbnails! But no previews!!! Is it possible a windows update killed the previews? Please help. If you have the same problem please write. It is extremely difficult to use coreldraw without previews...