Everything seemed to work fine prior to setting up my P: drive. I'm also unable to do a Arma3Tools_diag_retail due to it crashing after "Loading Hotfix Information" with:
"ERROR: Invalid argument/opinion - 'Library\SteamApps\common\Arma' -
Type "FORFILES /?" for usage.
which it doesn't let me type, after a few moments it spams a bunch of text and instantly closes. Screenshot of spam is linked