Code 19 - USB Ports Not Working - Yellow Exclamation Mark

I have a Dell 4600 running XP Home and all my USB ports have suddenly stopped working. When I go to the device manager and expand the Universal Serial Bus Controllers, each of the Intel(R) 8280 1EB VBB Universal Host Controller has a yellow exclamation mark beside them. When I check their status this is the message: Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. (Code 19). I was not in the registry prior to this, so I don't know how it got damaged
I tried this: Click Uninstall, and then click Scan for hardware changes to load a usable driver ? no effect.

I tried this: Restart the computer in Safe Mode, and then select Last Known Good Configuration,which rolls back to the most recent successful registry configuration ? didn't fix the problem. Microsoft says that as a last resort, you can edit the registry directly ? but I not sure where and what to edit in the registry. If anyone can tell me what keys to edit in the registry I would very appreciative. I will do anything to avoid reinstall windows from scratch. I unfortuately didn't have system restore going so I cannot use that.