My friend is changing his mobo to a better one will there be any problems such as info stored on his existing mobo.
Would you like to specify what you meant by "info"?
Most, if not all, data is stored in the hard drive/solid state drive. I'm not sure if BIOS settings are stored there as well but if I'm wrong, the only thing that your friend will lose are the BIOS/overclock settings.
If the old motherboard can save it's settings into a flash drive, and the new board supports the same thing or is the same brand, then that should be covered.
Although he/she may have to re-activate the OS if the unit is running on Windows 8/8.1..
he isn't ocing and i don't think he has ever changed any of his bios settings and he is runing Win 7 so i guess hes all good.
If you want to, clear the CMOS (check the manual) or just pull the battery and let it sit for a while, then put the battery back in.