My friend tells me he installed the RPG texture package on Minecraft and every time he loads the client the game crashes with the standard Windows Error Report box.
I have not been able to replicate this error
He may not have applied the HD texture fix required for some texture packs, or patched to a resolution still too low for that specific pack.
update Also (as in this case was the solution) an update will undo the patch so it has to be reapplied.
I realize that the problem is solved but here is to the people who still are having the issue:
Below this is a list of things that could be causing the problem, and below that is a list of fixes.
I hope this helped!