Yeah. Make sure that when you install it, no program that runs Adobe Flash is running. I recommend...
1. First, uninstall Adobe Flash using the uninstaller (Once again, make sure you aren't running any programs that are using Adobe Flash. This will cause it to not be fully removed, and thus screw up the installation) from here: How to uninstall the Adobe Flash Player plug-in and ActiveX control
2. Reboot after uninstallation
3. Try re-installing Adobe Flash again.
See if that works. If not, I did this process over again but with a ZIP file download of Adobe Flash and that worked. I would send you the link but I can't find it. I was searching through the help files on Adobe's website and randomly stumbled upon it.