I am also on WIn 7 64. But I don't have this issue ever.
Maybe you can try to disable any other 3rd party program that load on startup using the msconfig command.
a good guide how to use it -> http://netsquirrel.com/msconfig/msconfig_win7.html
you can disable any not important program from start-up. And enable it back once you done testing. Pleas dont disable those important program like antivirus and such.
Alternatively you can try to use this method-> https://forums.stardock.com/486023/windowblinds-support-faq#cleanboot
and let us know the result.