A common adware called Conduit SearchProtect, which changes your browser's homepage to Conduit.com, is causing major problems for users of Windows XP who uninstall it. When users uninstall Conduit SearchProtect from Add or Remove Programs in Windows XP, they find on reboot that Windows XP is no longer able to start. Instead they will be greeted with a message stating "NTLDR is missing. Press Ctrl+Alt+Del to restart".
If you have Conduit SearchProtect installed on your computer, do not uninstall it via the Add or Remove Programs control panel. Instead use a program like AdwCleaner or Junkware Removal Tool to remove Conduit SearchProtect. These tools remove the software using their own uninstall routine and are not affected by Conduit's buggy uninstaller. When using the previous links to download AdwCleaner or JRT, just wait a few seconds and the programs will automatically download for you.
For those affected by this bug, you can fix Windows XP by copying the NTLDR and ntdetect.com files from a Windows XP CD. The files are located under the \I386 folder and you can use the Windows Recovery Console or other bootable disk to copy the files to the C:\ folder. Once the files are copied back you should be able to restart your computer and get back into Windows.