In that case, Create a partition for Windows 8 (As big as you can) By going to into windows explorer and right clicking "My Computer" and Select "Manage". from there click on "Disk Management" You should see one or two partitions for "disk 0" right click a volume that is not essential to system boot or recovery and select "Shrink Volume" and shrink it to the minimum, you should have some unallocated space, right click the unallocated space and select "New Simple volume" from there Create the Most Space you can, after that is done proceed to restart your system, when it is starting up you should see white text saying "Press X to enter BIOS settings" the X varies from system to system but the most common ones are F11 Delete And F8, once you're in the BIOS, Head on over to boot order, put your Install disk In now, change the boot order so that the CD boots first, go on and save the settings and restart, and boot from the install disk, when it asks you if you want to Use Express Install Or Custom Install, press custom, select Your new Partition you created for windows 8 and continue to install, when restarting during the install, make sure to change back the boot order back to what it was, once windows 8 has configured, go ahead and open up my computer and copy all your data from the old partition onto the new partition and delete the old partition with a third party tool like EaseUS or AOMEI Partition Assistant so that you can resize the new partition to a bigger size
hopefully by the time i wrote all this, no one else has come up with a better answer hahah
Good Luck
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