Mac OS Leopard to Fusion

I worked with Mac OS X Leopard before until I tried upgrading it to Fusion version 1.1. However, after completing the upgrade process, my operating system suddenly failed to operate.
It prompted the message: ‘The application failed to initialize properly (0x0000005). Click on Ok to terminate the application’. Has any one encountered this error? I need your help on this.
Error Message:
aspnet_regiis.exe – Application Error
The application failed to intialize property (0xc0000005). Click on OK to terminate the application.
