If you are lucky...
You could try coping the CD contents into your OS clipboard and paste it onto your destop. Run the setup.exe from this desktop folder. It's worth a try although I'm doubtful it's the answer. (Opera shouldn't be a factor...use it myself.)
Could be XP SP2 related maybe have a look at this thread:
or perhaps the windows installer package isn't up to date...see this:
and this goes with the above link...it's to do with Office but note the cause of the error:
None of these things fixed my problem. The thing that got me closest to the solution was this link:
I tried to follow it's descriptions, but I couldn't find a folder in /Windows with the name /Installer (even after I choose to view hidden files in folders).
You certainly whent through allot to help, but none of the solutions fit my problem