A Windows user's antivirus software has stopped working. When the user reboots the computer and attempts to reopen it, it crashes once more. What are the TWO things that you should do to fix the problem?

You should identify the exact reason why an application crashes. It can be a hardware issue, a compatibility issue, or a variety of other issues. You can address the problem once it's been isolated. You should first search for application updates, patches, or fixes from the vendor. You can also repair the installation through Control Panel. If necessary, you can remove the software and reinstall it, but you should first try patching or fixing it.