Just looking at your system specs, you shouldn't have any trouble there...
Not sure if it's in the instructions, but if you're going to uninstall you should run a good registry cleaner prior to re-installation.
If you need one, there's a number of good free cleaners available such as this one from Glarysoft:
http://download.cnet.com/Glarysoft-R...-10798440.html
Also, be sure to remove any SH3 items from your 'My Documents' folder. Good luck!