Leon,
If your BIOS can see "C" drive that usually means its OK but if it cannot boot from it as in your message then something is wrong with MBR=MasterBootRecord. Which can be easily fixed since you have installation CD/DVD.
As others suggested, you have to set up in your BIOS to start from CD/DVD and then follow the prompts.
Step by step instruction with pics here, scroll down to Win8,1:
https://neosmart.net/wiki/fix-mbr/
Dont get confused with this:
bootrec /FixMbr bootrec /FixBoot
bootrec /ScanOs bootrec /RebuildBcd!!
It can be confusing for beginners! There are 4 commands there and each one executed in order:
bootrec /FixMbr Press: ENTER
bootrec /FixBoot Press: ENTER
bootrec /ScanOS Press: ENTER
bootrec /RebuildBcd Press: ENTER
Useful short video how to get to command prompt and type commands:
https://www.youtube.com/watch?v=f3gZdD9JX-o