This isn't exactly an editing question so I don't know if this should go here, but anyway...
Today I reinstalled Half-Life 2 and after I started playing it I noticed these odd white boxes that seem to appear at light sources (lamps, scanners, etc.) and were visible through walls.
Last time I played Half-Life 2 I never had this problem, and my settings then were the same as the settings I have now (everything set to low, DirectX set to 70).
I have a 256 MB ATI RADEON 9200 PCI (not express) card, if that helps. 1.8 GHZ, 765 MB RAM too. And I'd prefer more than a simple "U NEED 2 UPGRADE LOL," please. I know I need to upgrade but I don't plan to any time soon.