You need to provide computer and OS version DETAILS
What are the DETAILS of your computer hardware?
Which version of Windoze are you using, and how are you using it?
Also, what else is running in the background?
Welcome to the forum.
Here's the short-list of things to do. It's based on PC, but there should be similar operations for many on the Mac.
1.) run as Administrator
2.) turn off any anti-virus, spysweeping and pop-up blockers - ALL
3.) install on C:\ (your system HDD)
4.) shut down any firewalls, or OS securtiy modules (will vary greatly by OS version)
5.) make sure that you Extract the full download including the folder structures
6.) have adequate free space on your HDD
Hope that this helps, and good luck,
I have Windows 7, 64Bit if that makes a difference
That makes no difference. It could be, after having followed all Bill's suggestions, that you are still unable to install. In that case redownload again while have AV, firewalls, etc. off.