A bazillion options. Perhaps share the drive over a network. Or borrow/buy an external drive (they're really cheap), or install a virtual DVD drive (free) and rip to an ISO image, then install...
But copying onto a USB stick should work for most things. Make sure the stick is way, way bigger than the original disk if you're copying some MS stuff.
In other words, try it and see. You could have done it by now :-)