Roxio, head on over to their official site and download a small program entitled "aspichk.exe", which should be available in the Download portion of their website. This program will check on your installation and report back. If this program identifies errors or version mismatches in your ASPI installation, you may need to reinstall these programs to get your burner working properly. The driver files themselves are also available from Roxio's website.
Update: Apparently Roxio's website does not have the aspi layer. It can be obtained from Adaptec's site: Adaptec
Thanks to Frosty for the updated info.