You can use Spotlight search by typing pvm on the looking glass in the upper right corner, then clicking 'Show All'. But if you really want to look everywhere and in non user directories you'll need to use the terminal.
In Terminal.app:
sudo find / -name *.pvm
This will search whole the disk and external volumes for files (packages) with the .pvm extension, sudo is optional but if you don't sudo it will cough out a bunch of warning about folders it can't look into.
Last edited: Dec 11, 2012