Kernel changed after installing nvidia graphics drivers

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http://forums.fedoraforum.org – hi all.. im new to linux...and here is what happened. im having an intel E2180 processor with 2 gb RAM and an nvidia 8400gs graphics card. Lately i installed Fedora 12 on my system and found that with default settings the desktop 3d is not working. so installed the kmod-nvidia using yum after following the instruction.i also edited the grub.conf file to rdblacklist=nouveau to blacklist nouveau drivers. Then once i rebooted i found two kernels in grub ie the old one and the one with PAE extension. when i booted into the old kernel its Xwindows failed to load showing a black screen and when i tried the new PAE kernel it booted in 640 x 480 resolution. {earlier i was getting a resolution of 1440 x 900 on my 17" widescreen monitor}. it also showed that the nvidia drivers failed to load. I also read in some forums that the PAE kernels are for systems with 4gb+ of ram. So i thought it better to reinstall the whole thing. then i reinstalled the whole operating system using my fedora 12 dvd and performed the 'upgrade or replace the existing linux distribution'. interestingly now my older kernel has disappeared and the PAE kernel is the one that is remaining. this is the content of my grub.conf file # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a /boot partition. This means that # all kernel and initrd paths are relative to /boot/, eg. # root (hd0,6) # kernel /vmlinuz-version ro root=/dev/mapper/VolGroup-lv_root # initrd /initrd-[generic-]version.img #boot=/dev/sda default=1 timeout=5 splashimage=(hd0,6)/grub/splash.xpm.gz hiddenmenu title Fedora ( root (hd0,6) kernel /vmlinuz- ro root=/dev/mapper/VolGroup-lv_root LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet initrd /initramfs- title Other rootnoverify (hd0,0) chainloader +1 so how can i revert back to my original kernel??? ie the kernel that comes with the fedora dvd.. and how can i recover the system once the xserver crashed?? pls advice... (HowTos)