Debug VB .net Express 2010 Code to Windows 7

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Project Description:
I have a software written in VB. net 2010 Express running on Windows XP. After moving it to Windows 7 it is not working any more.
I receive 2 errors I cannot resolve and a few warning. This error belong to a procedure burning CDs.
I created some screenshots to give you a better insight.

Second thing is that I have 3 backgroundworker processes I need to be done better. These access some form element in an unsafe way and should be changed described here:

http://msdn.microsoft.com/en-us/library/ms171728%28v=vs.100%29.aspx?appId=Dev10IDEF1&l=EN-US&k=k%28EHINVALIDOPERATION.WINFORMS.ILLEGALCROSSTHREADCALL%29&rd=true&cs-save-lang=1&cs-lang=vb#code-snippet-1

BackgroundWorker1: burning a CD
BackgroundWorker2: simulating a progress bar, which is not the true progrss. Instead it should be done by use of events, see example:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa366443%28v=vs.85%29.aspx
BackgroundWorker3: prints a label on Dymo Label writer. during the burning process. There is no real need for a BackgoungWorker here.

I hope I could give you a good overview.

For any questions don't hesitate to contact me.

thanks and regards
Martin

Skills required:
.NET, Visual Basic
Additional Files: screenshots+error+windows7.pdf
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