If it was me, I would install USB ports on your home computer.
You just plug in a PCI card, window installs the drivers, and there ya go -- now ya have 2 USB ports.
You can find the cards at Wal-Mart, Best Buy, Radio Shack, etc.
Also, some employers have been known to fire people for installing software that is not 'company approved' -- I've seen it done.
If ya want, you can still download at work, then take the MP3's home on disk/memory stick/portable USB memory device/etc.
Chris