It failed. But what is it?
Try the usual with MSCONFIG (sorry but you did not reveal if this was Windows, what version, etc.) and disable items till you find what it is.
Also, for the more advanced user I suggest HIJACKTHIS and research of each line to understand the machine as it is.
when i turn on my lap top it gives a error message as follows.
"OBJECT REFERENCE NOT SET TO AN INSTANCE OF AN OBJECT"
However when close this message computer works in normal state as previous.But i have problem with regard to this message. Help me to clarify and fix this problem.