How to troubleshoot the "NTLDR Is Missing" error message

http://support.microsoft.com/kb/318728

Personal Reference

Just for my personal Reference

-wmic qfe <-list the installed hotfix on a machine
-wuauclt.exe /detectnow <-connect a computer to WSUS
-gpupdate /force <-refresh a Group Policy

How to uninstall a hotfix or Service Pack via the Recovery Console ?

Sharing this link on the above mention topic:)

http://windowsxp.mvps.org/spuninst.htm