i tried to compile the kernel 2.6.6 .......using these steps

initially i tried :
make dep modules modules_install install

eventually i reliazed that kernel 2.6.6 have to use "make" instead of "make dep"

so i recompiled again :
make modules modules_install install

after evryone was done...i reboot .....there was an option for me to choose linux 2.6.6 from GRUB....then i choosed it.....but the linux cant boot ...

ERRORS:
VFS:Cant open root device "LABEL=/"
Please append a correct "root=" boot option
kernel panic:VFS:Unable to mount root fs

what should i do ?

my grub.conf :

title Red Hat Linux (2.6.6)
root (hd0,1)
kernel /boot/vmlinuz-2.6.6 ro root=LABEL=/ hdd=ide-scsi
initrd /boot/initrd-2.6.6.img

should i roll back ?if so ..how can i do that? thanks a lot

change to where /dev/hdXX is your root (/) partition.

Have you done the mkinitrd -o command ?
You talked about roll back but when you install a new kernel you have do add a new paragraph to boot the kernel and not replace the old one.

now i am able to boot the 2.6.6 ....but a lot of modules cannot be loaded during the booting time...and i noticed that the mouse is too sensitive in 2.6.6

all u have to do is

make menuconfig

configure your kernel

make && make modules_install

cp arch/i386/boot/bzImage /boot/kernel-2.6
cp System.map /boot/System.map


edit grub to load kernel-2.6 and you're done.

Also with the 2.6.6 kernel you don't need hdd=ide-scsi