It sounds like you have Auto Insert Notification enabled. This will cuase the behavior you are reporting.
Read your manual Troubleshooting Guide section about the disc not being 100% written.
You can also find how to disable Auto Insert
by clicking here to read this web page.
Also, check out the Microstudio Tech Support Forum threads. If you are still having problems, run DXDIAG (there is a thread discussing this) and post the resulting file as an attachment here.