|This error appears when NTLDR's attributes have been altered or there is another problem with NTLDR.|
To try the most common solution for this, read the following article:
PS: NTLDR is compressed. Press CTRL+ALT+DEL to restart.
If the above does not fix it you may need to follow the more complex solutions described to when NTLDR is missing.
For some alternative solutions to NTLDR boot problems such as NTLDR is missing see the following solution:
Hope this all helps.