So after googling a bunch I couldn't find a fix for this, when I try to launch via Ashita I get the error "Process with an ID of 9984 is not running." with the following text in the support string:

System.ArgumentException: Process with an Id of 9984 is not running.
at System.Diagnostics.Process.GetProcessById(Int32 processId, String machineName)
at System.Diagnostics.Process.GetProcessById(Int32 processId)
at Ashita.Classes.ManagedInjector.InjectModule(Int32 processId, String module, Boolean suspendProcess)
at Ashita.Classes.AshitaInjector.<>c__DisplayClass1_0.<LaunchConfiguration>b__0()

Couldn't find anything about this on Ashita's site and google wasn't much help. Also tried running Ashita as admin, and moving the Ashita folder from the folder all the installs were in to my FFXI install folder and it didn't help. Any further ideas would be really appreciated!

EDIT: Please mark this as solved! Messing around on my own I attempted reinstalling all the VC++ runtimes, and that seems to have done it.