I had a similar issue with my old Sapphire RX 590....the card was a little bit heavy and kept slipping out of he pci-e slot overnight...the pci-e slot lock was loose....i believe its due to heating and cooling cycles...the issue was reduced after i got a graphics card supporter...still the pc...
I had the same problem while installing windows 11...the only way the nvme boot drive worked for me was not to unplug my win 11 bootable usb drive till you have completely finished configuring your pc including the reboot steps until you can log on to windows and install the motherboard...
Found some win 7 drivers..
https://www.driverscape.com/download/amd-k8-processor
it would be better if you download the cpu drivers from amds website...look under legacy drivers option...
win xp drivers....may work under win 7...
https://www.amazon.in/StarTech-4-Inch-Self-Adhesive-Rubber-RUBBERFEET/dp/B00032Q30Q
You can easily get stick-on computer case legs like these....
look for amplifier/furniture stick- on feet