Spine's requirements are very low. It can run on a potato. AMD or Nvidia or integrated graphics are all fine. It can even run in a software graphics mode.
If Spine is working and later stops working, something definitely changed and that is the real problem. Do your computers run anti-virus or anti-malware software?
There must be a reason Spine cannot lock those files. Try deleting a problematic file manually -- I assume you won't be able to. Use a Windows tool like Lock Hunter to see what process is locking the files.
Run the installer as administrator by right clicking the EXE file and choosing Run as administrator
. You may need to hold shift
when right clicking.