Here are Music / DJ software programs I've found on the WEB that are great if you're thinking about doing everything on a laptop.
Please note that all these programs were free when I originally downloaded them. I'm just going to give you the program names and the current active link. If you have any problems just contact me.
KraMixer - If MixSense doesn't work on your old PC, try to find this program. It's the first generation version of MixSense and it doesn't require as powerful a PC.
http://www.kramware.com/mixsense/download.html Please note that the KraMixer download is in teeny tiny words at the bottom of this web page.
If you're trying to set-up a PC DJ station contact me. I'll be happy to give you some suggestions or help.
Joe