I've done a little checking, and I may have a simple solution for you.
Click on My Computer.
When in there, select the problem drive and right click it.
In the new list of options, select Properties.
A new window will open, with tabs on the top.
Select the Record Tab.
Down at the bottom of that dialogue will be an option to open drive after burning.
De-select that (take out the check mark), and click Apply.
This should fix the problem.
Windows keeps opening the drive after the burn, while the burning software is trying to keep it closed to finalize the disc. That's why the error message.
Let us know how it works.