This PC can't run Windows 10.
It doesn't meet the system requirements.
About your PC:
Here's why Windows 10 can't be installed on this PC:
ATI Radeon X1250
The displey manifacturer hasn't made your displey compatible with Windows 10.
Check with the manufacturer for support.
what should I do?
Notebook HP Compaq 6715b, AMD x64, Win 7