How to undue Microsoft "critical updates"?

1) I continually get pop-ups recommending critical updates. I accidentally agreed to install them. BIG MISTAKE!
2) When I attempt to perform a "system restore" all restore points before the update have been eliminated.
3) During "start up" my computer temporarily freezes.
4) Saved Yahoo emails are lost.
5) Programs I have installed now require me to submit username & password. When I first started using those programs, I allowed them to remember my information. It's been over a year and I forgot them.
This operating system is Windows 10. I don't recall if I had an earlier version.

Laurence I2018-05-14T08:52:05Z

start a CLEAN OS(like a CD) and scan your pc for malware. You may also then find your restore points become available after booting the clean os. you may also find the links below helpful. Hiren's 15.2 is a clean os bootable to MiniXP from where you can clean your pc of the malware.

Richard J2018-05-14T05:00:26Z

Sounds like you may have a possible virus