In this tutorial, learn how to resolve the message at Startup: “The program can’t start because Qt5Widgets.dll is missing from your computer. Try reinstalling the program to fix this problem.“
This issue may happen after uninstalling Malwarebytes Anti-Malwaredue to a run key being left behind which calls programs and DLL’s which have been removed. To resolve the error, you need to manually remove a registry key in the registry.
You can refer how to fix missing DLL files in Windows 10 from this tutorial.
How To Fix “The program can’t start because Qt5Widgets.dll is missing from your computer” Error
1. Press Windows Key + R and enter regedit. Click OK to open Registry Editor.
2. Go to the key:
On 32-bit:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
On 64-bit:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
3. Find the key and remove any items refering to Malware Bytes or the file “BusinessMessaging.exe”
4. Restart your Windows.
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Hope somethings help you.