It sounds as though you’ve had a recent infection and one of your ‘anti’ programs has removed the malware files, or some of them, but not the entry in the registry. I suggest you, firstly, download and run the free Malwarebytes' Anti-Malware from http://www.malwarebytes.org/ to ensure that you are completely clean. If you then restart the computer and the messages are still appearing try one of these, but it is prudent to create a system restore point before making changes to the registry:
- There are a number of registry keys where the rascals could be hiding, so it’s quicker to search the whole registry. Open a Run window (Windows Logo key+R), type regedit and press Enter. Click Edit > Find and type URESUBAS.DLL, put ticks in Keys, Values and Data, then click Find Next. When it’s found in the right pane, right-click it and delete it. There should be only one entry but press F3 to continue searching, just to confirm there are no more. Repeat the search for CTRELI.DLL.
- If you’re concerned about making registry changes, remove the entry using the system configuration utility. Click the Windows Orb (Start), type msconfig and press Enter. Go to the Startup Tab and remove the ticks alongside URESUBAS.DLL and CTRELI.DLL. Click Apply, OK, etc. and restart the computer. When it restarts, put a tick in ‘Don‘t show this again‘ as you‘re effectively doing a selective start up.