I think that what you are in fact tying to do would be illegal & unsupported under the Discreet licensing agreement. Besides that I can not see that IBM box would be up for the task especially running an emulation go between! These systems run on IRIX/SGI boxes for a reason. If you really want to try & crack something at least keep this great software on a worthy platform like the Octane/2
If not go & simply buy Combustion 3 for you PC.