i don't know what to do, this pc seems to be badly infected...

[rcb56]

also i found windows defender antivirus can not be started and irunning

[rcb56]

that's meant to say isn't running

[Juliet]

Let's see if your machine is in need of windows updates

At the lower left of the tool bar, click on the Microsoft icon, type in windows updates, then at the top left click on check for updates,
this should open a new window
at the top to the right, click om the Check for updates button

Let's see if anything is missing here.

[rcb56]

omg, it says this which is the one i had that caused havoc for everyone! great now it has downloaded without me wanting it. it also says next version of windows is here do i want to install it...?

2020-05 Cumulative Update for Windows 10 Version 1909 for x64-based Systems (KB4556799)