I'm guessing here based on some symptoms I've seen here. First, see if you get the same behavior with Mozilla Firefox.
I have some Chrome problems that Mozilla Firefox also has and none of the other browsers have. Reinstalling the browsers doesn't fix it. That leads me to believe it's something wrong in the Windows 7 Registry, some setting that those two browsers share and that does not get reset in an uninstall/reinstall. I can live with the behavior here, but it sounds like you can't. See if your tech guy has Registry diagnostic tools that might help to find the problem or, at least, delete the settings that the browsers use so they can get reset when you reinstall.