cannot create back-up or acces phone contents

Hello. I have a Nokia 6670 and I wanted to create a backup today, but I cannot.
I first tried to create a backup on the memory card. It starded, wenta about 20% and then the phone restarted. Tried that 2 more times, same thing.
I tried backing up on pc, with both bluetooth connection and cable. I get an error message : "Backup definition cannot be read from the phone. The current task cannot be completed". I tried again to copy on MMC but this time the bar copying stops at around same 20% and it dissappears, leaving the Memory Card menu, from which i cannot exit. Nor does it work to close it by accesing the tasks list. Rest of phone works ok, but exept that I cannot close the memory task.
I tried with contents copier and selecting calendar, contacts and notes doesn't work either. I tried and managed to copy these 3, one at a time.
But I still need to backup the text messages from the phone.
I also tried accesing the the phone throught the phone browser, I see there Nokia 6670, but when I double click it says that the operation cannot be completed.
Please, can anyone help me create a backup of what I have on the phone? I need contacts, calendar, messeges(text plus MMS, no emails on phone), notes, to-do list.
Any ideas please?