First uninstall it by:
FOLLOW THIS STEPS:

Code:
root
mount /dev/mmcblk1p2 /and -o noatime
nitdroid-uninstaller
cd /
umount /and
if you want to remove installer
here the code:
apt-get remove nitdroid-installer
goodluck

then if you want to install gingerbread:

root
apt-get update
apt-get install nitdroid-installer
y

then open new x-terminal

root
cd /home/user/MyDocs
bzip2 -d gingerbread.tar.bz2
cd /home
mkdir /and
cd /
mount /home /and
cd /and
tar xvf /home/user/MyDocs/gingerbread.tar
dpkg -i /home/user/MyDocs/nitdroid-kernel-2.6.28-06_final1_armel.deb
6. On Xterm:
Code:
leafpad /etc/multiboot.d/1 (then press tab on your touchscreen