Just as the title says!

I didn't have any problems for the first few weeks and suddenly the game decided to stop opening. I've tried many of fixes/workarounds mentioned across the forums. Repair/Reset did nothing, and attempting to uninstall left many Gbs of files left behind. I want to try a fresh install on a new drive but first I want to remove absolutely everything from the 'old' version. I know how to sort the permission issues with accessing the folders but I don't really know what I'm looking for... There seems to be folders all over the place with many Gbs of data in them.

Is there a tool I use to strip EVERYTHING PSO from my drive? Very frustrating to have played for weeks with no issues and then suddenly everything has gone wrong all at once.

Thanks in advance.