I am not sure that I understand; if you mean that the file ripped with AG does not appear in the Audacity list, perhaps it is because your settings in AG are different due to the re-installing and the files are not saved where you expect them to be.
When you open AG and either click on the Settings icon in the ribbon or click Settings in the Menu, then click the General Settings... selection, the General Settings dialog will open; at the top of this dialog box is the field where ripped files are saved. Hopefully your files are there.
If not, then if you remember the name or part of the name of your rip, you can search your computer for it and locate the ripped files.
Hope that helps!