I'm posting a solution to a problem. Since I couldn't find its related question, I want to share my knowledge.
I installed Windows 10-64 bit fresh. And started installing drivers and some basic programs after installing Rollback and Avast. Every thing was fine here around.
Suddenly after installing some 6-7 needed wares, I noticed the same bug that even when my PC/Windows resources (CPU, Ram, Harddisk activity) were more than 50% free, yet installation of even the smallest ware like Adobe Flash was taking like forever. I tried the following and then happen to solve with the last step:
I installed Windows 10-64 bit fresh. And started installing drivers and some basic programs after installing Rollback and Avast. Every thing was fine here around.
Suddenly after installing some 6-7 needed wares, I noticed the same bug that even when my PC/Windows resources (CPU, Ram, Harddisk activity) were more than 50% free, yet installation of even the smallest ware like Adobe Flash was taking like forever. I tried the following and then happen to solve with the last step:
- Adjusted Windows settings for performance, rather than visuals.
- Tried boosting performance from the Control Panel> Power Plan> Maximum Performance.
- Searched 'msexic process' in the task manager to end, but it ended any ongoing installation, even abruptly ended Windows Features update changes, which was very painful, took a long time to undo everything and then redo.
- Then I found that perhaps there was something which was almost stopping the installations from even starting. And found that my new/changed user Account Control settings prompt was appearing in the background but for some reason wasn't showing to me. And installation dialogue/window kept waiting for the go ahead/my response.
- But ultimately, what solved my problem was that under System Properties> System Protection> Protection Settings, I had manually chosen the protection for 'C' drive. And this resulted in MS Volume Shadow Copy service to run and work in the background. And this was happening even when 'Rollback' was already taking (or trying to take) snapshots. As soon as I disabled this protection (or temporarily ended the Volume Shadow Copy Service process), my installation went as smooth as possible/expected.