It no way I could put Windows 7 on all of my systems if I would back in 2009 - utter muppets worked on Windows 7!!!!
I told you years ago on NVNEWS.NET forum about how unstable Windows 7 was with many issues. I remembered tested Windows 7 earlier beta builds for months on my desktop and my dad's laptop, I was very impressed it was very stable. The last time it was very stable, very fast, search files came up instantly, snappier, very responsive, no BSODs, dad's stock sidebar app worked fine and everything worked properly was build 7260.
https://betawiki.net/wiki/Windows_7_build_7260
After Microsoft signed off Windows 7 build 7600 as RTM, I downloaded iso from Technet and installed just fine on my desktop and on my dad laptop but 1 week later Windows 7 on my desktop PC gone very sluggish, slower to crawl, search files took forever, not snappier, apps unreponded everytime, Memory Management BSODs every few days and Windows 7 froze, unresponded for 1 hour with 100% CPU activity every few days then dad came to me told me stock app not worked. The next time Windows 7 froze for 1 hour, I managed to moved mouse cursor every few mins attempted to opened task manager found 100% CPU activity was caused by
searchindexer.
exe. Been tried cleaned installed Windows 7 and played 1 game for days without drivers installed but only 1 Nvidia driver installed so all these same issues still occured was absolutely my worst nightmare ever. You suspected my memory sticks or motherboard was faulty but I found either not faulty after tried dual booted Windows Vista and everything worked fine on Vista, no Memory Management BSODs and no freezes with 100% CPU activity. I opened Resource Monitor to monitored on searchindexer.exe for a week and very surprised to found it only used about 3% CPU lasted for a few mins but NEVER 1 hour!
Hmmm I decided to installed Windows 7 build 7260 over Vista and surprised everything was very stable after a week with no Memory Management BSODs, searchindexer.exe used 3% CPU lasted for a few mins and no freezes with 100% CPU activity. Then I installed Windows 7 RTM build 7600 and all issues still occured after few days so I thought maybe upcoming cumulative update on 22 October 2009 will fix it but sadly it did not fixed all the issues, no amounts of cumulative and security updates will fixed it. Windows 7 SP1 and the latest Windows Update up to 2019 did not fixed it. All solutions found on internet never fixed all issues too.
https://betawiki.net/wiki/Windows_8_build_7700
Fast forwarded to around 29 January 2010 when Wzor leaked Windows 8 build 7700, I downloaded and installed it, after a week I was very surprised build 7700 was very stable with no issues, no Memory Management BSODs and no freezes with 100% CPU activity, opened Resource Monitor to monitored on searchindexer.exe found it only used about 3% CPU lasted for a few mins. I ditched Windows 7 after about 6 months and used Windows 8 build 7700 full time.
Windows 8 first build 7700 was only 100 build higher than Windows 7 RTM build 7600, I never found changelog for Windows 7 build 7600 so I never knew what Microsoft developers changed made since Windows 7 build 7260. Wished Microsoft would extended Windows 7 test for 6 months and signed off Windows 7 build 7700 as RTM back on January 2010 then I would not encountered all these nasty bugs in build 7600. I never had a single BSOD on RTM of Windows Vista, Windows 8, Windows 8.1 and Windows 10 but Windows 7 was the worst ever with BSODs ever few days, Windows XP was not that bad with few BSODs every month with nvidia display driver infinite looping errors. It was incredible Vista fixed that nasty bug. 
