The Russian Programmers Group "staforce" has written a small program witch removes the lock in the kernel of the 32-bit version of Windows 7. With such an unlocked (patched) kernel all 32 bit versions of Windows 7 suddenly can use almost the entire 4 GB of RAM, 8 GB of RAM - up to 64 GB of RAM. The patch program automatically makes a copy of the kernel file, then removes the lock and integrates the new kernel file as an extra boot menu entry in the Windows 7 boot menu. Then you have the option to start Windows 7 either as usual with the original kernel or with the modified kernel. Details see here.