The backup.dll file belongs to HP OpenView Storage Data Protector by Hewlett-Packard. When you see the error, it means your computer’s registry tried to access a file that either doesn’t exist, was damaged, or was corrupted.
The only way to know if this is a legitimate Windows DLL error is to run a computer scan to check the location. For the majority of people, this means running a registry scan. Scanning your registry by hand can be dangerous and is not recommended unless you know exactly what you are doing. It is much simpler and safer to have software does this for you.
There are way too many DLL files to list, therefore it is recommended to run a registry cleaner to check the legitimacy of registry files. ZookaWare PC Cleaner is capable of resolving 100% of registry related errors on your computer.
After it completes its free scan, you can purchase a license to resolve the errors. Then your computer will be running like new again. Run ZookaWare PC Cleaner regularly and your computer will stay running like new.