You'll need to purchase a DVD/VCR combo that lets you record DVDs on to VHS tapes, along with blank DVDs and tapes. Also grab a low quality VCR from a thrift store or your parent's basement. The biggest expense to get the coloration back to your PC is an RCA video capture card.
Now burn a DVD of your footage/audio, put that DVD into the combo player and record to the tape. Now you have an analog source of things you digitally recorded. Use your low quality VCR (for extra coloration if needed) and hook it up to your capture card to get the analog signal converted back to digital. Play the tape and record the feed onto your computer and the process is completed.
May need some tinkering in post to get it exactly how you want, but this overall method has been amazing for me. If you want a sample of how it looks, I messed around with the credits score of the first Pokemon movie and gave it that coloration to enhance my illusion, give it a look here:
http://www.mediafire.com/download/jc5dxt22dcuxdtk/Pokemon_VHS_Credits.mp4
If you have any questions lemme know.