Hello. i bought a prebuilt pc and it has problems with windows. Games bluescreen and the usual error is Memory_Managment stuff. I searched for a solution and it was to run Windows memory diagnostic and have that fix it, but when i do it says that "\boot\memtest.exe" is either missing or corrupted. I do have windows installed onto a Usb and that has the memtest.exe. So can i replace it in some file and have it fixed? I would just do a fresh install but i do not have the windows key.