Can you boot up in safe mode? If so, try running a system restore from there and rolling back the updates.
Afterward, try adding the available updates one or two at a time - should have less issues, and will allow you to catch if it is a particular update that is giving you grief.
NTLDR = "NT Loader" = Boot loader. The machine can't boot in to windows. You need to get your windows installation media (XP CD) and reinstall your bootloader to get back in to windows. The URL provided by
Thinka should give you enough information to solve the problem.
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