Problem with my Default sms app

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Hi guys, i have a o2 zinc with wm6.0 , i've been having problems with my default messeging application, it runs to index only, i cant read sms's or reply to anything or write new msgs, the phone however comes with another app which is o2 sms plus which is great if i run it but, the msgs automaticly go to the default messging app , is their anyway i can fix the default messeging app or can i atleast use the o2 sms plus to make it the default? thanks in advance

anybody? i got registry editors, but know where to go..