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Hi Matt,
Thank you for posting in the Microsoft Community.
Sorry to know that you are facing an issue with Start Screen and Modern UI apps.
It would be helpful if you could reply to this question to assist you further.
Have you made any recent software or hardware changes on the system?
Let’s try the following steps and check if it helps.
Step I:
You may try booting in safe mode with networking and check for the issue. Post the results, so that we help you with further troubleshooting.
a. ****Right click at the bottom left of the desktop and select Run.
b. ****Type msconfigand hit enter.
c. ****Now click the boot tab.
d. Place a check markon the safe boot option.
e. Choose the type of safe mode by selecting one of the options below the Safe boot check box:
> Network- For safe mode with networking.
f. Click applyand then ok. Restart the computer.
Note: After you have finished troubleshooting, follow these steps to boot to normal startup.
a. Press the ‘Windows + R’ key on the keyboard.
b. In the ‘Run’ windows type ’MSCONFIG’ and click ‘Ok’.
c. On the ‘General’ tab, click the ‘Normal Startup’ option, and then click ‘OK’.
d. When you are prompted to restart the computer, click ‘Restart’.
Step II:
If you are not facing the issue in safe mode with networking, then place the computer in clean boot state and check if it helps.
Follow the steps to perform Clean Boot:
Step 1:
a. Press the ‘Windows + R’ key on the keyboard.
b. In the ‘Run’ windows type ’MSCONFIG’ and click ‘Ok’.
c. Click the ‘Boot’ tab and uncheck ‘Safe Boot’ option.
d. On the ‘General’ tab, click to select the option ‘Selective startup’, and then click to clear the option Load startup items check box.
e. On the ‘Services’ tab, click to select the ‘Hide all Microsoft services’ check box, and then click ‘Disable all’.
f. On the ‘StartUp’ tab, click ‘Open Task Manager’. In the Task Manager windowunder startup tab, right click on each startup item which are enabled and select ‘Disable’.
g. Click ‘OK’, and then click Restart.
Step 2: Enable half of the services.****a.****Follow steps 1a and 1b to start the System Configuration utility.
b. Click the Services tab, and then click to select the Hide all Microsoft services check box.
c. Click to select half of the check boxes in the Service list.
d. Click OK, and then click Restart.
Step 3: Determine whether the problem returns****If the problem still occurs, repeat step 1 and step 2. In step 2, click to clear half of the check boxes that you originally selected in the Service list.
If the problem does not occur, repeat step 1 and step 2. In step 2, select only half of the remaining check boxes that are cleared in the Service list. Repeat these steps until you have selected all the check boxes.
If only one service is selected in the Service list, and you still experience the problem, the selected service causes the problem. Go to step 6. If no service causes this problem, go to step 4.
Step 4: Enable half of the Startup items**.**If no startup item causes this problem, a Microsoft service most likely causes the problem. To determine which Microsoft service may be causing the problem, repeat step 1 and step 2 without selecting the Hide all Microsoft services check box in either step.
Step 5: Determine whether the problem returns.****If the problem still occurs, repeat step 1 and step 4. In step 4, click to clear half of the check boxes that you originally selected in the Startup Item list.
If the problem does not occur, repeat step 1 and step 4. In step 4, select only half of the remaining check boxes that are cleared in the Startup Item list. Repeat these steps until you have selected all the check boxes.
If only one startup item is selected in the Startup Item list, and you still experience the problem, the startup item that is selected in the list is the service that is causing the problem. Go to step 6.
If no startup item causes this problem, a Microsoft service most likely causes the problem. To determine which Microsoft service may be causing the problem, repeat step 1 and step 2 without selecting the Hide all Microsoft services check box in either step.
Step 6: Resolve the problem.****Once you determine that the startup item or the service that is causing the problem, contact the program manufacturer to determine whether the problem can be resolved. Or, run the System Configuration utility, and then click to clear the check box for the problem item.
Step 7:
Note: After you have finished troubleshooting, follow these steps to boot to normal startup.
a. Press the ‘Windows + R’ key on the keyboard.
b. In the ‘Run’ windows type ’MSCONFIG’ and click ‘Ok’.
c. On the ‘General’ tab, click the ‘Normal Startup’ option, and then click ‘OK’.
d. When you are prompted to restart the computer, click ‘Restart.
Step III:
If the issue persists, you may try performing a system restore prior to a point before you were experiencing the issue.
Note: When you perform System Restore to restore the computer to previous state, programs and updates you installed are removed.
a. Press Win + R and type in rstrui.exe and press enter.
b. Click next and Select a restore point prior to the issue and click on Next.
c. **** Click on Finish to perform the restore .
If you need further assistance, please reply and we will be happy to help you.