Sorry, I'm in the UK so it was gone 2 am when I fell asleep lol...
There is a guide on the link I gave you...
You have to navigate to the appdata/roaming folder... You can do this on windows 7 by pressing start, then typing %appdata% into the search box. You should see the roaming folder. Click on that then right click and select new. Then select folder. Name the folder IFCsavings.
Now just unpack the download and place the contents into the IFCsavings folder you just made.
You can now make a shortcut of the ifcsavings-qt.exe and place that on your desktop.
Click it and it should sync and you now have your second wallet installed...
Do NOT touch your infinitecoin folder in the roaming directory.
Let me know how you get on.