Reinstalezi driverul placii video.
Daca e placa nVIDIA, gasesti mai jos driverul corespunzator, dupa ce alegi
clasa si modelul placii in a doua, respectiv a 3 caseta de selectie.
Si bineinteles, versiunea de windows si limba sistemului de operare.
https://www.geforce.com/drivers
Aici gasesti drivere de la AMD, in caz ca ai placa Radeon
https://www.amd.com/en/support
Mai jos gasesti driverele de la Intel,
in caz ca ai placa integrata
https://www.intel.com/......ivers.html
sau
https://downloadcenter.intel.com/product/80939/Graphics-Drivers
Depinde si ce varianta de Windows ai...
Incearca si asa: intra in device manager, "display adapters" > "placa ta video" > "update driver software" > "search automaticaly for updated driver software".
Imi zice ca am cel mai bun driver instalat.
Am windows 7 professional 32bit
Am patit-o si eu, "am cel mai bun driver instalat" pe win 7 ultimate 64 bit. Pana la urma dupa ore si ore de cautari am ajuns la concluzia ca era un fel de virus. Am reinstalat win si am scapat de problema.