I noticed Windows was being unusually quiet... so I just tried to change the volume... there's a circle with a slash through it which makes me think there's an issue with the speakers... how do I fix it? Oh... and none of the stuff made by the game company Valve seems to work anymore... Hammer crashed... Half-Life 2 won't load... Portal won't load... sometimes I get an error message... other times it simply doesn't work. The error message says hl2.exe has encountered a problem and needs to close. We are sorry for the inconvenience. How do I fix it? And are my two problems related?