(1) Remove all the crapware you've listed, and all the other crapware you've installed but not told us about.
(2) Clean up after them.
If it still happens, there's a reasonable chance that something is trying to find something on the network and failing, assuming that when you say "nothing is happening" you mean
(a) no disks are spinning
(b) no CPU cycles are being used
(c) there's no obvious continuous network activity
(d) but you haven't actually taken a network trace.
So, a next thing to try might be to capture a network trace, then look at it to try to find anything that is trying to access an external resource, then timing out when it doesn't respond, then letting your machine complete its startup.