Creators update problem.

Hi blacksmith57,

That would be related with the security fix Microsoft released for the meltdown and spectre problems.
See Windows Client Guidance against speculative execution vulnerabilities - Windows 10 Forums

There's not much that can be done against the slowness, the black screen issue might also be a result of the security fix as I have them too from time to time since installing the update.

Unfortunately, since you have an older laptop model, your system is more affected than recenter models in regards to the slowness.

If you have restore point enabled, you could use it.
See Create System Restore Point in Windows 10 Performance Maintenance Tutorials

You could also uninstall the update
See Uninstall Windows Update in Windows 10 Windows Update Activation Tutorials

Uninstalling the update is not recommended, because the update is an cumulative update containing more updates.

This is a method I do NOT recommend, you'll need to boot into the recovery, go to the command prompt and uninstall the update using a command.
To get into the recovery, you need to shutdown the pc while it boots, for up to 3 times. Be warned, doing this has a chance of causing issues with your system that may result in temporary or permanent boot issues.
You might read on the internet that this happens to many users, but only those that are having issues go online for it, the millions of other users don't need to. The chance of something going wrong is pretty small, I have personally done this and never met an issue that caused corruption or boot issues.

Another potential solution is to wait. I and probably many others will face / are facing the same issue as you are, I waited for 15 minutes on my desktop until the login screen came and ran some tests to ultimately find out there isn't much I can do with the Meltdown and Spectre security updates installed to improve the boot speed.