|Start --> Settings ---> Control Panel ---> System ---> Advanced System Settings|
Under the Advanced tab, go to PERFORMANCE Settings.
Then go to the Advanced tab again.
Under Virtual Memory, click CHANGE.
Select Drive D: and then select NO PAGING FILE, and then click SET.
(This will delete the paging file from Drive D: freeing up some space, getting rid of that Vista warning.)
Just make sure you are doing this for Drive D and not Drive C - drive C needs a paging file to operate properly.