You don't need to.
The VI.LIB folder contains VIs that are part of the system.
LabVIEW 6.1 has its own VI.LIB folder with all those VIs in it, unless:
1... You have an add-on toolkit in 7 that you don't own in 6.1
OR
2... You put your own VIs into the VI.LIB folder (always a bad idea).