All of what follows presumes any issue that is occurring is not secondary to a malicious infection. If you believe it is, then your first order of business should be attempting to exorcise your system of said infection. Thatís a topic of its own and wonít be covered here.
Steps that you do not believe apply to your specific situation should be skipped over. For example, if an issue has not cropped up immediately or shortly after a Windows Update applied update has occurred, skip the portion that discusses what to do for that.
Certain issues point to device drivers being the most likely source underlying them. If thatís the case make sure you have gotten the latest device drivers from either your computerís OEM support pages or the OEM support pages for the component (e.g., video card, WiFi card, printer, etc.) and installed those and tested afterward.
If you are experiencing unexpected issues immediately or very shortly after any Windows update has been applied, then the first thing you should do is use the Windows 10 built-in capability to uninstall the latest update thatís suspected of causing the issue:
1. Open Settings, Update & Security
. This should take you to the Windows Update Pane by default.
2. In the Windows Update
Pane, locate the View update history control, and activate it.
3. In the View Update History
dialog, locate the Uninstall updates link and activate it.
4. In the Installed Updates
dialog, the updates will be listed in groupings, with the groups alphabetically ordered, and the items within each group ordered by date Ė most recently installed first (if no one has changed the defaults). In most cases, youíll be looking to uninstall a Microsoft Windows update, and those are generally the final group. The number of updates available for uninstalling is shown in parentheses after the Microsoft Windows group name.
5. Almost all Windows Updates will have a KB number associated with them, and if you know that use this as what you search on for the actual update. Select it.
6. Activate the Uninstall button located above the list of updates, and the selected update will be uninstalled.
If itís not an update thatís suspected of causing an issue, there are other steps you can take. Before going any further, it must be noted that a repair install (or feature update, when those are being done) allows one to keep all of one's files and apps (desktop/installed and store varieties). This is in complete contrast to a Reset (which allows either keeping just oneís files or wiping everything), or a Refresh/Fresh Start or Completely Clean Reinstall, both of which wipe everything.
My standard advice, in virtually all cases, (and presuming any potential infection has already been addressed, first) is trying the following, in the order specified. It is also presumed that you will have made a complete system image backup, and a separate user data backup, prior to using options two or three (and, if you donít already have a backup drive and a cyclic backup protocol going, this is your chance to start one, which is vital). If the issue is fixed by option one then there's no need to go further. Stop whenever your issue is fixed:
1. Using SFC (System File Checker) and DISM (Deployment Imaging Servicing and Management) to Repair Windows 8 & 10
2. Doing a Windows 10 Repair Install or Feature Update Using the Windows 10 ISO file
3. Doing a completely clean reinstall (options a & b are downloadable PDF files):
a) Completely Clean Win10 (Re)install Using MCT to Download Win10 ISO File
b) Completely Clean Win10 (Re)install Using MCT to Create a Bootable USB Drive
c) How to do a CLEAN Installation of Windows 10
(Tomís Hardware Forums, with screen shots)
choose the ďthermonuclear option
,Ē the completely clean reinstall, until it's clear that this is the only viable option. I hate having to go through all the work of reconfiguring a machine from scratch if that can reasonably and safely be avoided.