Why chkdsk in a Windows 7 and Windows 8 dual boot?!

In a PC with two main operating systems like Windows 8 and Windows 7, each one in a separate disk partition, there appears to be a problem when switching to Windows 7 (after having previously loaded Windows 8 and restarted the computer). This is a really annoying situation in which, just when you thought you were ready to start Windows 7, the basic black screen pops up with the message: "One of your disks need to be checked for consistency. You may cancel the disk check, but itis strongly recommended that you continue." Of course you can cancel the timed operation but it will show up the next time... and you are never really sure if there is an actual problem with your disk and/or each one of its partitions. I have not yet found the solution myself, but there are some options may be worth trying. The first one is to use the Bootrec.exe tool in the Windows Recovery Environment to troubleshoot and repair startup issues in Windows. Other options I will have to first find and then test, but I read somewhere that a Windows 8 not correctly shut down may affect starting other operating systems, like Windows 7. I'll post the solution when I find it.