Windows 10: Reinstall win 7 image on duel boot with win 10

Win 10 deleted my wifi card and some how deleted wifi on my win 7 so I have image of win 7, when I try to put image of 7 back it wants to format the whole drive. I just want to put win 7 image back hope it fixes the wifi card issue on both 7 & 10. I let win 7 update and it killed wifi and my touch pad on Dell 1501 laptop.I made repair disk for 7 but it doesnt ask which partition to put image back to and 10 was next to impossilbe to find drv. for I dont want to lose.Have 7 on ext H/D .I'm having to use my cell to search for help so its difficult .

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winload.exe not loading at start up D: windows 7 c: windows 10

I had a duel boot thinkpad with win 7 and win 8.1. I installed windows ten over win8.1 with my files kept, but had lockup issues so I did a reset of windows ten. At startup no option to choose windows 7 although it is in tack on drive D. Any help?

 

boot manager

When win 10 became available I downloaded it and created a dual boot pc. Win 7 on C drive and Win 10 on D partition. Liked Win 10 so followed the following steps to make pc Win 10 only. Upgraded to Win 10 on C drive, eliminated and wiped D partition. Am
using selective startup. Now when booting, get boot screen with Win 7 or Win 10 choice, (but only have Win 10, Version 1511, on pc). If choose Win 10 pc unzips repair files, tries to fix windows and fails, tells me to choose Win 7. So I chose Win 7 and pc
boots into Win 10. So I opened msconfig, checked boot tab and have Win 7 listed as current and default OS and Win 10 below it. But I don't have Win 7 any longer. How can I fix this without reinstalling Win 10? Also thought going back to normal startup may
help, but when selecting normal startup and restarting computer, windows resets to selective startup. Hate the thought of wiping hard drive and reloading windows and programs.

Thanks for any help.