I have previously used Premiere Pro many times on this PC but it has recently stopping moving past the initial start up window; I have tried uninstalling and reinstalling, installing different versions, holding alt to wipe preferences and running as an administrator. Nothing moves it past the same point.
It gets stuck on "Loading MHPC_InitHelper.prm" every time.
This error occured before I tried updating it, I thought the update might do something different but it just did the same thing.
All other Adobe software work fine, only premiere doesn't, so I can't finalise projects like I normally would.
Any solutions? Reasons why not a single version works? Why did it previously work fine and why has it now randomly stopped?
Try clearing the plugin cache. You held down Alt to reset the prefs, now make sure all Pr processes are killed in Task Manager and launch Pr holding down Shift+Alt. The Shift modifier resets the plugin cache.