Question Took out my gpu, but when I put it back in, drivers were deleted, and can't them back

[MagBoi]

So I have this old pc running windows 7, and wanted to try a new gpu, so I took the old one out, and put the new one in, but nothing happened on my monitor, so I put the old one back in again. Only thing is, when I booted it up again, it was in some weird resolution, where all of the applications were 3 times bigger, and I got pop up's, telling me to install gpu drivers. So I found the old gpu box and the driver cd, put the cd in my computer, where it loaded the driver installation thing. From there I clicked install, waited and when it was done, the computer still said it needed drivers.

I really don't know what to do about this, as I can't find anyone else that has this problem online. So if anyone knows how solve this, please let me know, and thank you in advance.

 

[RealBeast]

You should download the latest drivers for the GPU that you are installing from the manufacturer web site using another computer and put them on a USB stick to install upon installation.

You should also have deleted all the drivers from GPU A prior to inserting GPU B -- they generally all need different drivers and it would save a headache.

The lower resolution is the base case when you have NO driver that is working.

 

[MagBoi]

I can still go on the web on the old hag, can't I just directly download the drivers from the same pc?