new PSU, new graphics card, new cpu fan and case fans, new CD drive and even a new PC case, so only the processor and hard drive are original. Since then, I have changed everything on the PC i.e. The problem is an 8GB OEM recovery partition which came with the then Packard Bell Vista PC, because when I replaced the MOBO and had the OS changed to W7 (OEM upgrade), I asked the store technician to remove the OEM recovery partition, but after taking advice, he said it could not be done, and I later read online that OEM recovery partitions are EFI protected. Several DISM/Scanhealth scans show there are no corrupt files. This dual core ASUS P5G41T desktop was the next to make the successful swap to W10 (by upgrade, with most of the drivers intact), but now a couple of blank screens and frequent crashes when using the PC has made me decide to change the 12yr+ Seagate hard drive to a new Sandisk SSD before the drive expires on me. Thanks once more to everyone who helped me successfully transition my ASUS notebook and then ASUS Core i5 desktop to W10.

Windows 10 delete oem partition