Please don't use a registry program unless directed to do so.
The entries you note are not registry listings. The first two are your scanner.
The file maxlink3.dll, contains program code used by the Visioneer 'PaperPort' program. It provides code required for the 'Paperport desktop' function. The other one is the ScanSoft PaperPort Page View Application. These two are fine, leave them alone. I say that because scanners seem to be notorious for not working properly if you play with their files. Leave them alone for now.
I am investigating the other two.