I think the maximum you can do in fat16/32 is 2GB, but if you make the disk size 4GB unformatted > go to the load and save tab > check the disk label box > name your disk to whatever you like say RAMDISK > then click Start Ramdisk.
To format the ramdisk go to > Administrative tools > Computer Management > Storage > Disk Management, here you should find your unformatted Ramdisk, you can change the letter of the drive to R if you like to help identify the disk.
Then right click on the Ramdisk and select > Format > Quick Format > NTFS, you should now have a NTFS Ramdisk.
Now you can just copy files or programs to the Ramdisk and run them from there.
Click on start Ramdisk and you should be good to go.
If you want to save the contents for use after a system shutdown or whatever, go back to the DataRam program window, click on the Load Save tab > tick the Save Disk Image on Shutdown > Select the location to save the image in the box below.
You can use different file names to save different data that you might want to use in the Ramdisk.
Once you have done this click Stop Ramdisk and the image will be saved at the specified location.
If you want the Ramdisk to load up certain files/programs on startup just tick the Load Disk Image at Startup Box and select the file.
Phew it takes longer to write than to do

anyway that should get you going.