unable to boot Fedora Core (2.6.20-1.2962.fc6xen)

[manish soin <manishksoin yahoo co in>]

I recently upgraded my fedora core 6 from Fedora Core (2.6.18-1.2798.fc6xen) to
Fedora Core (2.6.20-1.2962.fc6xen). I installed all the packages to upgrade.
I am able to boot Fedora Core (2.6.20-1.2962.fc6xen) however login screen never comes and first time I got an intel graphics error.I cannot start Fedora Core (2.6.20-1.2962.fc6xen).
what should I do.I can start Fedora Core (2.6.18-1.2798.fc6xen) and windows vista please help in starting Fedora Core (2.6.20-1.2962.fc6xen).

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