I'm on an 8300, but I had the same problem and here's the fix.
I downloaded the latest BlackBerry desktop software from blackberry.com. I downloaded the English version with media manager.
That gives you an .exe file, which is a self-extracting archive.
Use WinZip to unzip the .exe file to a folder. Browse to the SR_MM directory and you'll find "Roxio Media Manager.msi".
The next time you are asked for the location of Roxio Media Manager.msi, click browse, and browse to the file that you extracted above. Let it install, reboot when it's done, and you should be good to go.
That worked for me, anyway. Blackberry 8300. BES. WinXP Pro SP2.
Your Mileage May Vary.