reboot loop problem with sp2

Tried installing sp2. message error installing certain
components, do you wish to uninstall? ok button being the
only option. clicked and when restarted went in to restart
loop after displaying windows splash screen. Unable boot
by any options by F8. ie. safe mode etc. only option which
worked was 'disable restart on system failure'. when
selected it came up with error message mentioned in kb id
885533. Accordingly proceeded to uninstall sp2 from
recovery console,as suggested. But, alas, before doing so,
did not select 'disable reboot on system fail' this time.
So now sp2 is uninstalled, Still keeps rebooting and the
above mentioned option is not available any more. Any
suggestions to fix my problem is greatly appreciated thanks

Nat