Limewire won't install properly
 

I have been using limewire for several years now and have never had a problem with it before. When i went to update to the new version of limewire i get an error message telling me that there was an "error opening file for writing: C:/Program Files/Lime Wire/Limewire.exe" i can either abort the installation, ignore this issue, or retry the installation. i have tried all three and nothing works. My computer has Cisco Clean Access Agent on it, however i have tried uninstalling the program and putting limewire on my computer with no success. Please somebody help me figure out asap what's wrong and how I can have limewire again :confused:.