Can somebody please verify this Weird shapes in sample programs


I’m trying to see if there is a defect with my vid card since I have been having some problems.
When I ran the SmokeParticles test, it runs nicely, but close to the top right hand corner, there is a small white oval shape… similarly in ‘particles’ program, there is a red circle on the right bottom…

Do any of you guys also get that or something wrong with mine?