Multiple BSOD - now error 0x8007025D

Hi,

Windows 10 Home 64 bit - I'm afraid I cannot run the tool I'm supposed to to post in this forum, but that is because my PC is currently not usable. See below

Forgive the long story, but I feel as much detail as possible is a good thing and I'd be really grateful for some help please!

A couple of months ago I decided to enable XMP mode on my Asus Z87 motherboard because userbench website reported that my RAM was Corsair Vengence clocked at 1800mhz and was running slowly. I checked the BIOS and sure enough, XMP was disabled and the RAM was running at 1333Mhz. Upon restarting, I recall quickly receiving a BSOD. I put it down to what I'd just done and turned XMP off again. I wasworried I'd overclocked and damage my RAM or something.

Since then, I started to notice the occasional BSOD - usually MEMORY MANAGEMENT, but not always. Kernal security one time, something about a corrupt page file. They were rare. One every few days, but more than I was comfortable with.

Fast forward to last week and the BSOD had gotten a little worse. Strangely, they never happened whilst doing something strenuous, like playing a graphically intensive game, but whilst browsing on Edge.

Now yesterday: having become bored of the occasional BSOD, I tried running sfc /scannow but it said resource protection couldn't complete the scan. I received a similar error running the DSIM fix to verify Windows 10.

I then noticed whilst working that MS Office then had weird problem - updates failed with a 'something went wrong' error. I tried uninstalling MS Office and received a similar error. A MS tech had no ideas. "Something is seriously wrong with your OS" he said. He suggested a repair in place upgrade using the media creation tool.

I did that and found that sfc /scannow worked, but the same problem with Office persisted and the BSOD happened almost immediately.

I performed a reset of Windows 10, the next most intrusive option. I kept my files, but chose to lose the apps etc. So it was more or less a clean install.

BSOD fairly quickly.

So, I thought, f -it. I downloaded Windows 10 onto a USB, restarted, deleted my HD partitions and decided upon a clean install.

That's where I am now. It gets part way and then pops up with the error 0x8007025D - important files could not be installed.

I have tried removing all hardware except for the monitor, keyboard and mouse (corded) and the USB stick with the install on it. Nothing helps. I now have no OS but the install fails with this message.

UPDATE - I also tried to install from a DVD so don't have the USB stick attached either. Nope!

Please help.

Does anyone have any ideas? Could it be the RAM? I don't want to go too far putting thoughts in anyone's head though. Could it be something else?

Another questions... if new RAM doesn't help - what can I try??

Thank you

Matt