Tech Support and Windows Vista Home Premium

I've owned several Dell computers over the past 20 years and up until now have been happy.  In January of 2009, I purchased an XPS M1530 that came with Vista Home Premium installed.  Two months ago, the Matshita DVD became disabled.  When I checked the properties, the error message stated that there was a corrupt or missing registry file.  I called Dell and a tech support rep took control of the computer, the proceeded to delete a lower registry filter file.  This seemed to fix the problem.  The next day, the DVD drive was again disabled.  This time a tech support rep took control and deleted an upper registry filter file.  This again seemed to fix the problem.  A week or so later, the DVD drive was, yet again, disabled.  This time Dell sent a repair technician to replace the Matshita DVD drive.  After looking at the computer, he stated that the problem was with the operating system and replacing the drive would not resolve the issue.  He stated that the only way to fix the problem would be to reinstall the Windows Vista Home Premium operating system.  Three days ago, I called Dell and a tech support representative walked me through the process of reinstalling the operating system.  He then took control and reinstalled the drivers.  At that point I was happy, as I thought surely the problem was resolved.  Yesterday, (12/11/2009) I used the DVD on several occasions to play music cd's.  This morning I turned on the computer and watched as 66 Microsoft updates were installed.  Upon completion, I restarted the computer (as instructed) and attempted to listen to some music.  Surprise surprise the DVD was again disabled.  This time when I called Dell, I explained that the previous tech reps had replaced reg filters and the repair was temporary.  I explained to here that I wanted the issue resolved.  The then told me that since the other technicians had deleted reg. filters and the problem was not resolved, that she would not do the same.  She then took control of the computer and proceeded to do the exact same thing.   Needless to say, I was not happy.  She also stated that the problem was with the Vista operating system.  She transferred me to a software rep who proceed to try and sell me the new Windows 7 operating system for around $200.  I explained that the computer was still under warranty and the computer, for which I paid $1,200, came with the defective operating system and they should provide the system at no cost.  He then told me that I didn't have "software coverage".  He then tried to sell me "software coverage" for my XPS and also for the Inspiron 15 that I've ordered for my son for Christmas.  I feel like I've been screwed, tattooed and RIPPED OFF!  I never thought  I would ever be treated like this from Dell.  I'm really starting to believe the Apple commercials.