Iphone 3g/ 2.0 jailbroken

my cydia keeps crashing
i wanted to re install it

Through Winscp >>>>I entered in command.... "apt-get remove cydia" and it freezes every time.

When i enter "apt-get install cydia" .... it says "cydia is already the newest version"

how do i remove cydia and re install it again

Installer source to get Cydia >>>>http://apptapp.saurik.com <<<< is not working for me either....

plzzzz helpppppp