Runtime error Nuendo 4

After installing Nuendo 10 yesterday I could access both my old Nuendo 4 version as well as the new Nuendo 10. But after adjusting my soundcard buffer to check out the performance the version 4 wont start. On start up it comes up with the message
"Runtime Error!
Program: C:\Program Files (x86) \Steinberg\Nuendo4\Nuendo4.exe
This application has requested the Runtime to terminate it in
an unusual way.
Please contact the applications support team for more information.

Version 10 and 2 work fine. I’ve got some projects on version 4 that I want to work on. Any help would be appreciated thanks

Just open your N4 projects in N10.
I doubt that this extremely old N4 version wil/canl run properly on “modern” OS’s.