Apologies if this has been posted before; have been searching and can't find a fix. Recently bought and downloaded GTA IV from Steam, but every time I try to play it, the screen fills with random blue (and sometimes white, green, and red) flashing 'pluses', as per the picture below.
I'll be honest, I don't know much about computers. Mine was given to me by a friend, and it usually does the job, but I don't know how/if I can fix this. Any help would be greatly appreciated.
OS: Windows 7 Home Premium (6.1, Build 7601)
Processor: Intel® Core i5-2500 CPU @ 3.30GHz (4 CPUs)
Memory: 4096 MB
Video card: AMD Radeon HD 6800 Series
~ Total VRAM: 2800 MB