NOD32 Antivirus System v.2.7. error

Hello everyone,
I’m having trouble with the NOD32 Antivirus System v. 2.7. When I try to start up the program an error message pops-out:
An error occured during N0D32 initialization
WINDOWS NT ver. 4 or higher is required to run this application.

I’m using Windows Vista OS and it’s supposed to be enough for the program to work, but it’s still annoying me.
If someone has already had this problem please post suggestions.
Thanks.
