PowerIso Virtual Drive prompting for installation error

Hi.
I am using PowerIso 4.4 and 4.5 and I'm facing this error message:
''PowerIso Virtual Drive is not installed correctly. Please reinstall it''.
The program was functioning properly some days ago.
To resolve this, I uninstalled it and then installed it back, but nothing changed.
Please help me solve this.
Thanks a lot.
