I downloaded Softimage AutoCAD 2013 and it was working a couple of weeks ago, it took abit of time to open though, now it does not load, yesterday I waited for over six hours and it still didn't load, is there something I'm missing?

There's no such thing as Softimage AutoCAD. There's Autodesk Softimage and Autodesk AutoCAD, but not Softimage AutoCAD.

Anyway, what are your computer's specs?

Microsoft Windows XP
Home Edition
Version 2002
Service Pack 3

Intel Pentium 3.00GHz, 2.99 GHz, 3.25 GB of RAM

Perhaps this better belongs in the tech help area, I was hoping to see some new models.

First thing you can always try is a simple system restore to a point in which the program was working properly. I know my antivirus for a while would like to quarantine a part of the license server keeping me from using XSI, since it was new software that my GF bought I didn't pick up on it right away, perhaps something you have installed recently is interfering.

If you mean Softimage(not autocad)then you could try running runonce.bat in Softimage/application/bin(I think, just search for it otherwise).