Ok, it's time for me to see some screenshots of this. Can you select both files in Bridge so they appear side-by-side in your Preview Panel (make sure you're in "Filmstrip" workspace or similar) then show me a screenshot?
Yes, still an issue unless you've taken specific steps to mitigate. In Photoshop, have you gone to Edit>Preferences>Performance, and set additional Scratch Disks? If yours is only set to C drive (by default) that won't be enough. Add another drive as well (one with plenty of space).
Also, in Bridge's preferences, I strongly suggest setting up your Cache folder on another drive, not C.
And even when you've done all of that, I STRONGLY recommend not having too many other programs open while you're running Photoshop.