I have a TSST Corp. DVD+RW installed on my Dell Laptop. I was convrting and burning some movies with a trial version of DVD Santa, and the first several DVD's worked fine. When I put a DVD+R disk in now, I get the pop up to perform several task...music CD, etc...but not to create a DVD. I have installed several burners to see if that was the issue (including Nero 7.0). The convering appears fine...It starts to burn onto the disk and I get an "invalid disk"error in Nero. Any suggestions? Thanks!