Help!

I fired up P8 this morning and after loading a figure, I touched the camera controls and lost any info on the screen.  Tried another camera where the character was still visible and touching the camera controls did the same thing!

Shut down P8 and restarted, loaded a recent scene and did a render - no problem.  But, as soon as I touched a camera control in preview - no image again! (Also lost all lights and couldn't reload any from lights library.)

Tried removing program using CP Add/Remove programs and then reinstalled replacing legacy info with new.  Installed latest SR3 update

Fired up P8 and had exactly the same problem!!!

What do I do to get a useable P8 again!

PS:  Running XP32 with 4MB Ram and ATI HD4670 vieo card with latest updates

Any help much appreciated!!