Windows 10 Insider Preview Fast Build 19631.1 (mn_release) - May 21 Insider

Attrexx said:

I tried MANY proposed solutions from around the net, but ended up reinstalling Windows altogether and losing some data.
Needless to say I am pissed.

Check out Macrium (free) and create images of your working OS. Any future disaster and it's simply a matter of restoring that image in a few minutes. Plenty of tutorials on this forum.

Especially as the Insiders Program is a testing channel.

Attrexx said:

I tried MANY proposed solutions from around the net, but ended up reinstalling Windows altogether and losing some data.
Needless to say I am pissed.

Agree completely with the Macrium suggestions, but......... at the very least you could have copied your data somewhere else prior to a clean install and blowing it away. Unless I am missing something.... don't think I am.

Turned out ok for me in the end but the offline phase was very slow and often seemed stuck with little activity. The temptation to shut it down was great.

Attrexx said:

I tried MANY proposed solutions from around the net, but ended up reinstalling Windows altogether and losing some data.
Needless to say I am pissed.

Insider OS is unpredictable sometimes. You shouldn't be mixing it with any of your data.
A lot of us here actually have it installed on a separate drive. Otherwise, a Macrium image will always save your day.

badrobot said:

Insider OS is unpredictable sometimes. You shouldn't be mixing it with any of your data.
A lot of us here actually have it installed on a separate drive. Otherwise, a Macrium image will always save your day.

Or have it installed in a VM. Much less stressful.