Setup error message when installing into another account on same computer!

[Twiggy]

My daughter has been using Limewire Basic for sometime now with no problems, I downloaded it onto my user name with no problems but another daughter wishes to download it onto her name (all same computer) but I get a setup error message when I try, which reads

Error opening file for writing
C:/program files/Limewire/genericwindowsutils.dll

if I look at the details it reads,

output folder C:/program/files/Limewire
extract: COPYING
can't write C:/program files/Limewire/genericwindow utils.dll

Not being terribly computer au fait, I just need to know, step by step how to go about rectifying this problem, thanks in advance to all those better informed than myself!!