Power Point

If Online Repair itself has been “preparing” for 6+ hours, then it’s definitely hung, not just slow. At this point:

Yes, you should interrupt it. No benefit in waiting longer.

After reboot, don’t try to repair again

Since Online Repair already failed, repeating it usually just loops.

Go straight to the clean removal tool:

Use:

Microsoft Support and Recovery Assistant

This is important because:

Online Repair can’t fix deeply corrupted installs

This tool removes everything (including broken Click-to-Run components)

Then reinstall fresh

After the tool finishes:

Restart again

Reinstall from your account:

Microsoft 365

Hi, you mean you are now doing the online repair, and it has been running for 3 hours now?

Hi! Let me help you.

Does it happen on a blank PowerPoint or on all the documents that you open?

Follow these steps in order, testing PowerPoint after each step:

1. Run a full Online Repair of Office
   1. Close all Office apps.
   2. Open Control Panel → Programs and Features (or Apps & Features in Settings).
   3. Select Microsoft 365/Office, choose Change → Repair.
   4. Choose the full Online Repair option (more thorough than Quick Repair) and let it complete, then restart Windows.
2. Start PowerPoint in Safe Mode to check add-ins
   1. Select Start.
   2. Type PowerPnt /safe and press Enter.
   3. If PowerPoint opens without the repair error:
      • Go to File → Options → Add‑Ins.
      • At the bottom, set “Manage” to COM Add‑ins and select Go.
      • Clear all check boxes to disable add‑ins and select OK.
      • Close PowerPoint and open it normally.
   4. If it now works, re‑enable add‑ins one by one, restarting PowerPoint each time, until the problem returns. Leave the problematic add‑in disabled.
3. Repair Office again if PowerPoint hangs or freezes If PowerPoint still hangs, isn’t responding, or freezes even after the above, repeat the Office Repair from Programs and Features as described in step 1.
4. Check antivirus interaction
   1. Make sure antivirus software is fully updated from the vendor’s site.
   2. If the antivirus has Office/PowerPoint integration, temporarily turn off that integration or its PowerPoint add‑in (not real‑time protection) and test again.
   3. Re‑enable protection after testing. Changing antivirus settings can increase risk, so only adjust what is necessary and consult the antivirus vendor if unsure.
5. Change the default printer
   1. Open Control Panel → Hardware and Sound → Devices and Printers.
   2. Right‑click “Microsoft XPS Document Writer” or “Send to OneNote”.
   3. Select “Set as default printer”.
   4. Reopen PowerPoint and test.

If none of these steps resolve the issue, completely uninstalling Office (including leftover folders and registry entries) and then reinstalling, as described in the referenced Q&A threads, is often required to fix persistent repair loops.

References:

• PowerPoint isn't responding, hangs or freezes
• how i can fix the microsoft app problem - Microsoft Q&A
• How can I get office 365 to work? - Microsoft Q&A