Net Framwork 3.5 Sp1 ???

where is what your old nero?
if it's asking you to remove previous version of nero remove it yourself from control panel
then download cc cleaner
google it's free clean your system in case old version has left some junk behind

or if your looking for framworks here it is
it's free download it from Microsoft

http://www.google.com.au/search?hl=en&client=firefox-a&hs=bBw&rls=org.mozilla%3Aen-US%3Aofficial&channel=s&q=Net+Framwork+3.5+sp1&btnG=Search&aq=f&aqi=g-s1g-sx9&aql=&oq=


i don't know why you would want to install nero junk on your pc to begin with its the biggest memory and process hog