Have you had a recent infection?
If so, it sounds as though your antivirus/antispyware has removed the malware file(s) but not the reference that loaded them. You can remove the errors as below but not being able to restore the computer suggests you are still infected.
Remove the entry by clicking the Windows Orb (Start), type regedit, press Enter and navigate to registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run.
In the right pane look for the dll name and if it’s there, right-click it and select Delete.
Repeat it for this key HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
Repeat it for the other two dlls that are identified as missing.
If you can, create a system restore point before making the deletions just in case you have a problem.