1. Uninstall the casino software.
2. Clear the browser cache, history and cookies.
3. Manually remove any remaining icons in the programs and start menus.
4. Manually remove all registry entries (advanced users only).
You may want to evaluate why you're having to hide online gambling (or your associations). Just a thought.
The Free software that I gave him a link to in my prior post, does all that in a few clicks and no registry to manually clean. The software has a very good reputation, plus it's free.
I have gone for the up front solution. EVERYBODY who knows me probably finds out pretty fast that I gamble. I do NOT lie about it, if asked (and by someone who is something to me) I will admit that I am partial to a little (or even a lot) of online gambling. Before 2004, pretty much everybody knew I could never walk past a fruit machine arcade without ending up inside itIt all depends on the kind of person you want to hide your online activities from. (Just noticed VWM said the same thing). For instance if your partner was an IT expert then you will need to be very thorough. If you partner hardly ever uses a computer then you can just clear the basics like internet history etc
Even if you follow all the tips people have mentioned here you are still exposed, because you cannot control the influx of emails and mail that may come to your door. Also now google knows you are gambling then your online profile has already been created, innocent things like MSN messenger, Yahoo, Facebook etc will all start to have targeted gambling adverts towards you.
The only way to be completely unexposed is to be either upfront about your online activities, or gamble from a computer out of reach of the person you are trying to conceal traces from. ie an internet cafe or a friends computer. This however will lead to further problems, so stick to the flash versions and limit the amount of accounts you open, thus reducing the gambling related amount of files that remain on your pc.