can't add anymore virtual drives? none now.

[Apebc]

I've recently upgraded from daemon tools lite to daemon tools pro. I had 3 virtual drives with lite, and when I uninstalled lite (automatically done by daemon) and installed daemon tools pro, there was only one left, and when I try to add one, it says: "you already have the maximum number of virtual drives". I've tried to delete the last one, now I still can't add any more. I've tried to reinstall, also no success. does anyone know how to add more?

(Windows 7, 64 bit, Daemon tools pro standard edition, 5.2.0.0348, SPDT version: not installed (no idea what that means))

[Terramex]

Please try to manually delete upper/lower filter as described here (Resolution):
The CD drive or the DVD drive does not work as expected on a computer that is running Windows Vista (also works on Windows XP/7/8/8.1).