Yesterday was Bad News Day for W10 upgrades!
The upgrade on the old Dell (2008 vintage 1525) running W7 Pro 32 bit went so far and then failed, but at least it did then automatically restore to W7 quite well, and so that seems OK.
OTOH, the little ASUS nettop (1225C with 4GB of RAM, so it's not short in that area, although the AMD processor is short of grunt) running W7 Home Premium 64 bit is in the doo-doo
- initially it could not download the W10 updates when I allowed it to, and got no further
- rebooted and started the process without letting it try to do the updates, and it eventually got to the W10 desktop, but did not seem to be running very happily and so I tried to install System Mechanic Pro (as on all the other machines) to clean up the system. That did not start well because it would not accept my paid-for Licence Key and so had to try go into Trial Mode, but before I could do that, the machine appeared to "stutter".
Can't remember exactly what happened, but it offered to go into Recovery Mode to roll back to W7 and so I told it to do that - and that's when the REAL problems started. Left it try to do the roll-back overnight but it had not got very far this morning.
Multiple reboots appeared to have got somewhere near the W7 config but it would not boot and the only option at that point seemed to be Startup Repair mode, but that did not work, and it does not seem to be able to get anywhere and in Normal Start Up there is a BS showing memory errors and collecting data - and then it automatically reboots ( I think part of the Repair mode problem, which also affected it in W7 mode, is that I partitioned the disk, as I normally do, and, even though the hidden System Partition is still there, it cannot seem to find it).
Rebooted many times, hit F8 to get the boot-up options list and have tried most of them - booting to Safe Mode gets as far as the log on screen for me to enter the local user password - but the keyboard is then not working, so I can't!
Tried the Repair Mode Advanced Options (again) and that told me to log on as a local user, which I did, but that then got only so far and then the machine bombed and restarted, but now done the same again and managed to get to the Command prompt, so running Chkdsk/f to see if that might fix something but it did not.
What this all
seems to be telling me so far is that the upgrade appears to go quite well on more modern and quick machines which don't have too much programme data & info on a simple disk configuration, but becomes rather chancy on older/less well endowed machines. Also, as well as backing up your data, make sure you have made a couple of successful recent System Restore points before you start.
Will try a few more things, but may finally have to resort to that spare licence I still have (I hope!) from buying a 3-licence XP/Vista upgrade disk to upgrade to W7 a few years ago and then completely reinstalling W7 from an external DVD drive!
Miracles do happen! Quite accidently managed to get to the Factory Restore process (and THEN found some Youtube videos on how to do it !) and so it looks like I not going to need that upgrade disk and so-on - should have thought of that before. Luckily, I hope, it will only do the restore on the Boot Partition and leave all the stuff on the Extended partitions intact.
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