Windows 7 ram

Enough to do what?
To just basically run Windows 7? Yes.
If you're into games, then maybe not.
You would have to check the game's website and see what the recommended configuration is.

Hope that helps.

Even for most games 4 GB is enough... 6 the most you'll see an appreciable benefit.
But, if you have only have the 32 bit version on the OS, you can only have 4 GB of RAM anyway.
Some heavy photoshoping, video editing, ect. you'll need more than 4 or 6 GB of RAM. But chances are, if you're doing that kinda thing, you already know about it

Presumably you're running the 64-bit version? Otherwise 4GB is too much.;)

4GB is enough for day 2 day needs and gaming.