I noticed that when finished updating drivers from downloads, the prior version remains on hard drive in a folder.
Is it okay to delete prior update folders?
Will the current installed drivers be effected?
You can delete any older driver folder, you only need the most current one since they've fixed a little bug.
The bug I refer to was that if you manually uninstalled the drivers sometimes it wouldn't clean everything up and leave an entry in Programs and Features which would say ATI Catalyst Installer, same as the new drivers, and would cause a BSOD if you ran that one. They fixed it with the Crimson release.
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