iTunes drivers cause DVD drive to disappear on Dell Latitude D630

I recently installed itunes 8 and tried to burn an audio CD only to discover that my DVD-RW drive had disappeared and on the device manager it gave an error code 19 - registry damaged.

Dell business support informed that I needed to delete the upper & lower limits in registry. Which I did. Well my disc drive reappeared but now when I start iTunes it tells me to reinstall iTunes as the drivers which control the DVD & CD burning have been removed- hence I cannot burn any audio discs.

My concern is that if I reinstall I will just change the registry setting again and cause the drive to disappear. 

Can anyone help with a solution to this problem?

Thanks 

RUnning a Dell Latitude D630   Windows Vista   SP1, 2GB Ram: TSSTcorp DVD+-RW TS-L632D ATA device;