You have anti virus running while installing ? if so try turning that off . Iv had a problem in the past with one of the driver versions where it wouldnt take, that might be the case with you and should try a diferant set of drives , Im running the 71.22 beta drives and got a pretty decent increase in performance, you may want to try those out.
Athlon 64 2800+ clawhammer 512 kb
MSI k8t neo mobo
MSI 6600 gt
samsung 512 mb pc 3200
WD 80 gig ata100 7200 rpm
Onboard sound / realtek 5.1 based sound
7 year old cheap *** 17\" monitor but looks great , im surprised its still running , its bin through 5 computers so far.