Shouldn't be the Bios as Windows sees the available disk space.
What OS are you using? If you have a Windows 7 disk, boot from that, as it runs setup go to advanced and you can add the additional partition from there. It will be quick formatted. Once you have the new partition created, remove the DVD and reset/power cycle the PC (so you don't reinstall). When it boots back up as normal, go back to disk management and you will then be able to assign the partition a drive . You won't need to mark it as "active".
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Good Hunting!
Captain Haplo
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