windows wont boot on second computer

[chipbreak]

So i had an old pc in the back room that i wanted to try to run. i took a spare HDD i had lieing around (was empty) plugged it into my current pc and download windows 7  and installed it on the  spare hdd. i am able to boot in to windows and fool around so i know it cant be my hdd thats the problem, but when i unplug the hdd and put it into the old pc it wont load just keep wanting me to repair the OS, but it cant find a fix.

thx

[Arty]

windows 7 doesn't really play nice with system swaps

 

how old does the pc even support windows 7?

xp and 10 seem to do better at it. 

 

Wait you installed windows 7 from your main pc?

 

their isn't going to be a boot loader on the spare hdd if you had windows on your main hdd. and installed on your spare

[unidentical]

If you installed windows with a different motherboard/memory/cpu/video driver, trying to then use that OS install on a different computer not going to work so well.

Install the drive in the desired computer first, and install windows from there.

[Arty]

1 minute ago, unidentical said:

 

Install the drive in the desired computer first, and install windows from there.

/\

this would be ideal solution. 

[chipbreak]

1 minute ago, Arty said:

windows 7 doesn't really play nice with system swaps

 

how old does the pc even support windows 7?

xp and 10 seem to do better at it. 

the pc is only 5 years old. when i bought it came pre installed with windows 7. 

[Arty]

Just now, chipbreak said:

the pc is only 5 years old. when i bought it came pre installed with windows 7. 

Wait you installed windows 7 from your main pc?

 

their isn't going to be a boot loader on the spare hdd if you had windows on your main hdd. and installed on your spare

[LogicalDrm]

You are trying to swap HDD with windows and drivers between two systems? There's your issue. Windows with drivers doesn't play nice with two different mobos. You could do that with Linux and Windows without drivers.