I think i have a soution for this problem.
I had the problem today and tried a lot of things to correct it.
I burned the DVD on a Benq DVD burner and installed with Plextor DVD drive first. Then i tried a Plextor DVD burner i had in spare. Then i took my Benq burner and the problem was still there. Then i burned the DVD on the Plextor DVD burner and tried to install it again from this drive.
I tried all this cause of what i read on the forums. Nothing worked.
Then i read that someone had the problem with a USB drive inserted. He unplugged it, tried again, and it worked. Then it got me thinking....My solution:
I went into bios, told it that i had no 1,44 drive installed (which i didn't anyway), and then it worked!!!
Hope this can help some of you