Nokia :: 7610 Supernova - Get Stuck After Deleting Several Text

Actually I have 5600+ text messages in my inbox and I wouldn't really like to delete them all at once, but select like 1500 of them who are from certain people and leave the rest which makes like %70 of existing messages. Although, it is nearly impossible and needs a prophet-like patient to do that, thus I thought it is best to connect mobile to PC via using USB cable and Nokia OVI suite, whenever I have tried that it always stuck after deleting several messages(sometimes this number is 15, sometimes 30-40.. but no more then that). Stuck for my situation means, u gotta remove the battery and turn the phone again. I also tried to do the same with Nokia PC Suite, but the same as OVI happened. Manually from phone, selecting, messaging --> delete messages --> delete all message in inbox folder makes happen the same too just like trying to go in the inbox and mark all the messages there, select delete marked.