[GAMEPLAY] White squares appear over casted abilities

Just installed League on my new laptop and played my first game on it. Most abilities cast a white square around the character model or the ability itself. For example, Garen E (Steel Legion skin) causes a white square to spin around him, Q causes a white square to appear around the sword when he jumps, and ult causes a white square to manifest on the whole screen. Elementalist Lux has white squares around her E and ulti (at least). Placing a ward causes a white square to appear where the ward is. And the nexus exploding causes a giant white square to appear.

The bug happens consistently, every time those abilities are cast, wards are placed, structures destroyed, etc. I can try to get a screenshot if the description wasn't helpful, and I can post my specs if need be.

Thanks! -Omagga