The other two files I mentioned should also be present.
However, the servers.def.vpu doesn't include the list of update servers, that is contained in the servers.def file.
My servers.def. is shown as 9KB or 8744 bytes, it is a text file containing a list of 61 servers and the servers.def.lkg in my case is the same.
My servers.def.vpu is shown as 1KB or 894 bytes, so your one would appear to be fine.
In windows explorer ensure that all files and extensions are shown, Tools, Folder options, View, 1) Show hidden files and folders, 2) uncheck Hide extensions of known file types.
Regardless of the outcome if you can't find servers.def, try the avast repair as I mentioned.