Not unless you can retrieve the previous version of the .xml file and restore it. And the chances of doing that, unless you had a saved copy under another name, are about zero, I'm afraid. You'd spend more time failing to do this than you would in recreating the presets.
I think i found it. but its a DLL file. is there any way i can fix it?
It's not a DLL - that's a Dynamic Link Library file, and you definitely shouldn't muck about with it.
As I said before, if you didn't make a backup of your .xml file, and you can't find it anywhere else, then there's nothing you can do - period.