I am a bit of a gamer and I often buy my video games at a few different stores including; gamestop, exlibris etc. But sometimes these games are not in english, so what I have to do then is buy them online from places such as amazon.co.uk.

I know its a long shot but my question is: are there any stores, in zurich or zug that carry on english video games?

Yes!
There is softridge which sells game in english, and even in the NTSC format if you ask them to. There is one in HB and another one in Stadelhofen.
http://www.softridge.ch/

I use this one and I also order games from amazon.co.uk, which are usually cheaper.

How about a US format game store? or do I have to find it online?