Can not return desk to win 7 but did successfully return lap top dest top is not operable - need he

Installed win 10 on lenovo desk top and lenovo lap top. decided to go back to win7 for both. Ssuccessfully (I think_) got lap top back to win7 but not desktop which is now inoperable. Need help thanks
 

Cobalt006

TS Evangelist
From the sounds of it . It did not return t to win 7. You may need to use your recovery Partition in the laptop. To do a reinstall of win7
 

Cobalt006

TS Evangelist
It is possible the recovery partition maybe corrupt. If so you will need the original install disk. Or a copy of win 7