mgb
Just because SME8 works on certain hardware does not mean that SME9 will work on the same hardware.
You need to confirm that the hardware (computer) you are installing sme9.2 to, does support that version of SME/CentOS.
Check the manufacturers compatibility lists for CentOS 6.9
You can download CentOS 6.9 & try installing that, if it installs OK then SME9.x should install.
If CentOS 6.9 does not install OK, then you probably have compatibility issues.
Some issues could be solved by disabling features & drivers in BIOS.
Also you could download the SME9.2 iso file again & reburn a DVD/CD, perhaps your download or burn process was faulty.
You should also run the media test on your SME9.2 DVD/CD & do the checksum test to make sure the burnt DVD/CD is good.
You need to be more descriptive with the information you provide us, your comments are very short & not very informative.
Take a screen shot with a camera/phone showing the error on screen & upload it here or to a free image site & post a link here.
You need to give more information about what you are doing, exactly what hardware (computer brand & model etc) you are using & details about the error message or messages, & details about the steps you followed to get to that point in time (what you did step by step to get the error).