fatal system error

I have a 'fatal system error' as described in the this post

https://forums.moneysavingexpert.com/discussion/2700509

Bascially I had a warning on my Avira saying that I had a winlogon.exe threat/virus, a iexplorer.exe threat/virus and one other that I can't remember.
I rebooted and started in safe mode, ran a full Malwarebytes scan - it found a couple of viruses and so I removed them.
When I restarted there were no icons, taskbar or start button on my desktop so I decided to try a system restore to a date a week ago.
Once this took place I then got the blue screen and the fatal system error - exact same one as in the post above - still get the same blue screen when I start in safe mode now or last know good configuration.

I have followed the instructions in the post linked above and so far I managed to download Hirens boot cd and can boot mini xp from that.
From this I ran SuperAntiSpyware and it found one item - System.BrokenFileAssociation which I removed. When I try and run Malwarebytes I get a 'Run-time error '0'' and then RTE 440.

I also tried to download Kasperskys CD and I think it worked ok as it ran in my machine and showed 7 errors but for some reason it didnt list/show them. I hit the quarentine button, nothing really happened and when I then tried to boot normally I still get the fatal system error. One thing that lead me to think that it might not have downloaded correctly is that I had to burn the Kaspersky CD using BURNCDCC.exe (from Hirens file) as I could not seem to burn it using Nero.

Apologies for the long post but I thought I would try as much as poss from the other post before asking on here. Any help would be greatly appreciated!!

Thanks,

Mark.