Problem with Dreamweaver CS3 trial

I have just downloaded, the 30 day trial it ask where i would like to install
it to.... i press continue then it goes to 100% then a error message

A problem occured whilst extracting some files. Check available space on your
computer and the write privileges on the destination folder..

i have 75gb left and i'm doing it to my desktop so no privileges needed

im on xp home edition