I've been looking for a while for something like this. None of the work arounds I could find worked. I wanted a RAMDisk so I could run some portable apps (such as firefox + its cache, and BonkEnc) from it.
I finally found one that works, no hassle. Supports Win 7 32bit and 64bit
Its listed here at the top (the BETA)
http://memory.dataram.com/products-a...wnload-ramdisk
If anyone has any questions or comments, please feel free to post them here.