caveats such as turning off AV programs, making sure no malware exists, etc., I'd be curious to know if you don't have bad RAM. I'd download and run Memtest86 or similar. As well, if you have two or more RAM modules, interchange them and see if the same message recurs at the same time or still occurs but referencing a different memory location. I've had an OS install fail repeatedly at the same spot and found bad RAM to be the cause even though the machine had been running without apparent problems.