This is a bit involved for a quick answer, but if the above does not work, I _think_ it can be done using ADB (Android Debug Bridge).
Oh crap, I just realized that ADB debugging is probably not turned on on your device, but here goes, just in case:
You'll need the Samsung drivers, these work well for a 32bit windows system:
https://copy.com/nmVrZenehMCA
Then the quick and easy way to install ADB:
https://copy.com/HwFzVjRTKMrZ
After getting the drivers installed and adb installed, plug your phone in to your pc and issue the following two commands:
Code:
adb shell
recovery --wipe_data
Like I said, this is probably too involved for the quick guest question section, and I only found that command with a quick google search, so. . .
good luck
p.s. for you and the readers,
always turn on USB debugging on your android device as soon as you get it. It does no harm at all and can be indispensable some day when something goes terribly wrong.