A. Most third-party DVD writer applications don't function correctly under Vista, which restricts the ability to burn ISO files to physical media. One solution I found is to run the dvdburn.exe utility, which comes with the Windows Server 2003 Resource Kit, on your Vista installations. To do so, use this format:

dvdburn <burner drive letter> <ISO filename path>  
as the following example shows:
D:\Programs>dvdburn h: "D:\OS Images\Windows Vista (v5728-16387) for X86 and X64 (English)\vista_5728.16387.060917-1430_x86fre_client-LRMCFRE_EN_DVD.iso"
You can download the tool from http://www.microsoft.com/downloads/details.aspx?FamilyID=9d467a69-57ff-4ae7-96ee-b18c4790cffd&DisplayLang=en . The resource kit also contains the cdburn.exe utility, which you can use to burn CD images.