After installing the game, I have started the game and I have below massage on screen what can I do?

"Wrong disc inserted.
Please insert the original "HOMM5" CD/DVD"

Ive got the same problem.
all minimun requirments of my PC are OK.

I got the exact same problem. My computer way exceeds all the requirements for the game and Heroes works on all of my other computers. I did notice something however. When I installed the game, the installation started with disk one and data.cab files 1 and 2 but then skipped to disc 3 and data.cab file 4. After that, it skips to disc 4 and data.cab file 5. It completely skipped disc 2 and data.cab file 3 and I think that's what my problem is. i have tried to install the game several times and I always have the same outcome.