Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
This has happened to me with the freeware F86 Sabre. I uninstalled it and VR is back to normal.
I think I found the culprit. I uninstalled the DLSS upgrade that seemed to all the rave and put back the original DLSS file and problem solved. I am so glad I had the foresight to back up the original.
LouP