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This same thing happens to my friend.One day he installed some file(.exe).The file installed properly but the next day when he starts his computer he got a error “Drive not ready”.This happens due to installation of that unknown file(.exe,.bat).Another Reason:This can be due to many reasons like the media reader, USB external drive,floppy. Just go into device manager and disable the floppy drive.This problem is not due to your hard disk problem.Mainly disabling problematic device is solution.
 
Basic Steps:

1. Use anti-virus,anti-spyware,anti-adware check.
2. Do the windows disk cleanup & error checking.
3. Use Pc repair software to repair.

1. Defragment your Hard Drive.

• If the drive diskette is not inserted properly or the drive door is not closed then it occurs.
• This can happen due to the bad disc(Due to reading problem). 
• If the Power Connection and the Daisy Chain of the drive is not connected properly then the error comes.
• If the Cable Connection of the drive is loose or setup is not correct then it comes.
• If the drive is totally damaged then it sends the error massage.

• If the problem is of Drive Diskette or not closed Drive Door then you should insert the Drive Diskette properly and you should also close the drive door.

• If the problem is of the Power Connection and the Daisy Chain is loose then you should connect them correctly.
• If the cable connection is loose and the setup is not correct then the cable connection should be connected properly and the setup should also be correct.Open your system unit(Cabinet),check the wire connected or not also check for the power connection.

• If the Drive is totally damaged then your should replace it with a new one by checking all the things above. 

• Why CMOS BATTERY STATE LOW message comes?
• Why CMOS MEMORY SIZE MISMATCH ERROR Comes.
• Invalid Configuration please run setup program.
• CKSUM ERR(checksum error)