Neddy Kins said:
As I have mentioned in the title it only happens in source games, so this is games like TF2, Garry's Mod, Half-Life, etc. I don't see how using my PC at another house hold would affect the results. Not unless you mean try using their PC's? And yes their Pc's work on these games.
I think its a motherboard problem! Are you using a USB mouse or a PS/2 mouse