Help force close when trying to delete msgs

[chris106]

i have never noticed the automatic delete feature on the desire, so as a result i have thousands of sms messages, from just my girlfriend over the months ive had the phone i have 4500 and many from other people, so now my phone runs very slow, opening, recieving messeges etc. Anytime i try delete messages it freezes then says msg force close and no messages have deleted????? how can i sort this????

cheers chris