Thanks, I'll look into that. I am not sure why one out of three computers would gain 15gB at all, let alone as restore points due to the upgrade, but I do find that with W10 some things that are "impossible" happen, as well as some things that should work, don't.
(I am beginning to think I just need to roll that particular computer back to my image before the Anniversary Upgrade and let MS try again.)
I hate to say it but almost everything you say here makes no sense at all. If you can, you will have to explain it beyond anything your already have posted.
I have all kinds of software on my hard drive. Some of it also has been discontinued. That doesn't mean it won't run. Streets & Trips is not part of the OS. It was not removed, just broken. Somehow, the registry is incorrect and cannot be corrected, even by reinstallation. It should just have been left alone to run exactly as it did on W10 before the Anniversary Upgrade. It has been there through at least Vista, W7 and, until August, on W10. No problems. An OS "upgrade" to a new version of the same product should be just that. New stuff wrapped around the old. It doesn't, if done properly, require me to do anything.
I am looking into restore points, but neither of my other two computers, all configured to do restore points, have anything like the 15gB growth since the "upgrade". For that matter, on any major upgrade, not just a "patch", Windows should clear out obsolete restore points. After all, they would roll the new system back out. W10 has other provisions to do that, although many of us have found out that it is also sometimes defective.
If W10 is so bad that I need to reinstall all my old software by following each update with a clean install, that means at least 6 days of sitting at my computers getting to where they were before the "upgrade". Not gonna happen!
Follow up: You hit the problem, but the reaction was even stranger than I expected. To test the premise, I recorded the size of SVI and it was 22.5gB. I created a restore point to try to find the size of my average restore point and to see how SVI would change. The total size of SVI became 2gB!!!!! And it did not remove any of the listed restore points that have occurred since the Anniversary Upgrade. My total size for C: dropped from 53gB to 36.1gB.
I can't explain the original problem except that the Anniversary Update screwed up and did not clean out some stuff it was supposed to take care of. Creating a new restore point made it evaluate what was stored there and it "fixed" itself.
Thank you again, for pointing me in the right direction. During the process I also found some useful tools from some of the other posts which helped diagnose the problem. Ten Forums is the place for W10 problem resolution.
Glad you solved it. And yes, I suppose it's possible that this was old restore points that got cleaned up when you created a new restore point. Upgrades are often problematic, as there is no way for Microsoft to anticipate every possible upgrade scenario. Sometimes you have to punt, sometimes you don't.
Really did not gain 15gb, just that some old info that was stored from housekeeping for allowing the OS to make programs pull up faster, etc., just got cleaned out.
You have to really look at the before and after with the Graphical disk size programs. They help to show where wasted space is going. I have Windows 10 running on my wife's laptop with just a 120gb Samsung 850 evo 3D SSD. She still has around 80gb left for open space.
Nothing to explain or repeat. Windows 10 is not the problem As I stated before, if you are using discontinued or outdated software, Windows 10 will detect and delete it, especially Microsoft licensed products. It states it in the TOS and all over microsoft.com about how they set out to get rid of user's bad habits and also protecting the OS from having outdated full of security breaches software being ran in Windows 10.
Solved: (or at least corrected) See posts 9 and 13
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