When I start my desktop it gives me an error about
How to get rid of it?
I found nothing when i started regedit.exe and searched (F3 or CTRL+F) for BackgroundContainer.dll
This was a malware. It was removed by your AntiVirus Scanner, but the registry entries are still present to start the malware at startup.
To be safe, make a full scan with an AntiVirus Scanner like Microsoft Security Essentials/ Defender and also scan your PC with Malwarebytes' Anti-Malware.
If you can find nothing in the registry, download and run Autoruns from sysinterals and look here for an entry " BackgroundContainer". Look under
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