I'm not an expert on Dell or anything, but that path is a user account. Dell have an account on that laptop, presumably for remote access, community access or fault fixing. Either way, it is just a user account. If you deleted it, this error message will go away.
Bit of a sledgehammer to crack a nut perhaps, but if it were mine I would right click "My Computer", choose "Manage", doubleclick "Local Users and Groups", choose Users. At the right pane, choose the Dell account, rightclick and choose "delete".
Please don't follow this suggestion blindly...
The likelihood is that you are currently logged into the computer via the account called Dell Desktop rather than it being a separate account, so deleting it would have you either come up against an error (because you can't pull the rug out from under your own account), or you would end up either logging in as administrator and blatting your own usual login, or (just as bad) manually hacking away at deleting things via file explorer if you couldn't easily delete the account in a single action.
Also, if the dll is found in that account and you
are actually using a different account, it won't remove the message as the program that calls the dll won't exist solely in the same account as the dll - you'll always get an error unless you remove the way the dll is called (the easiest way would be by editing the registry, but if you're a novice Windows user I wouldn't recommend a cavalier approach to the registry).