"E:/Sources/Install.wim" sounds like a file on the CD. If the file "is missing" that usually means the iso or the CD burn was defective. You should check the iso you downloaded with an md5sum tool (there are many free ones on the Web, just google it). The md5sum is:
Originally Posted by muckpuck
Be sure to understand how to use whichever md5sum program you choose. Usually the program is run from the command line.
Also, it is possible that the program you used to burn to CD also will compute the md5sum, so check that - if it does, you don't need another md5sum program.
Then burn the CD very slowly - like at 4x. Again, some burners will "verify" the burn, that is, compare what is burned to the iso file. This takes a while, so be patient and let it finish.
After getting a good CD, be very careful to follow the Microsoft instructions exactly. If you want, you can try the "Automatic Repair" but I must say that it worries me on a machine with Vista installed by the manufacturer. I prefer using the command line programs manually, but those programs are powerful so, again, be patient and careful.