If you're crashing when searching in Excel, there are a few things you can do to troubleshoot the issue.
This may seem like an obvious solution, but sometimes Excel just needs a fresh start. If you've been working in Excel for a long time, your computer may be running low on memory, which can cause crashes. Restarting your computer will clear your memory and may help resolve the issue.
If you have any add-ins installed on Excel, try disabling them and see if that fixes the problem. To do this, go to File > Options > Add-Ins. From here, you can see a list of all the add-ins you have installed. Select the add-in you want to disable and click Go. This will open up a dialog box where you can deselect the add-in and then click OK. Repeat this process for all of your add-ins until you find the one that's causing the problem.
If restarting your computer and disabling your add-ins doesn't work, there may be an issue with your Office installation. To repair Office, go to Control Panel > Programs and Features. Find Microsoft Office in the list of programs and click Change. From here, you'll want to select Repair. Once the repair is finished, restart your computer and see if the problem is resolved.