Here's a way that works with almost all wireless utilities.
First you must download Cheat Engine. It's free. Download, install it and start it.
then you must open Intel ProSet WiFi. Click on the Profiles button, select the profile you want, then click the Properties button.
Now you'll have a new window named "WiFi profile properties" opened up. Now click on "security settings" and at the right side you should see the asterisks covering up the password. Now the password should be decrypted in memory. Leave this window open!
Now go back to Cheat Engine. Click on the first icon, the one that says 'select a process to open', now scroll down and select the process associated to the password window, the one named 'PfWizard.exe" and click 'open'.
Now, change 'value type' to string and in the "Text" field above, enter the exact (case sensitive) name of the wireless profile, then click "First Scan".
On the left you'll see a generated list of memory addresses. Right click on the first address and select "Browse this memory region". A new window will appear. In this new window, on the bottom half, scroll down a few pages (4-5 pages) and you'll see the password in clear text.
If the password doesn't show up here, you can try to "Browse this memory region" for the other memory addresses in the list and scroll down in the memory map. Eventually you'll see it. The memory address may differ from computer to computer, OS to OS and proset version. So you'll have to do a bit of search yourself.
This was tested on XP 32bit running Intel ProSet 220.127.116.11. If Intel makes radical changes to ProSet, you can always export all your profiles, uninstall ProSet, install ProSet 18.104.22.168, import back your profiles and then use the method described above.