why windows seven takes higher memory.?

Something is going on with microsoft security essentials.
I have never seen it eating that much power on my own system.

I would guess it is eating the cpu time as well.
You may want to look into its settings and see that it's not running scans when you are trying to use the system for other things.

One thing to remember. You won't be able to utilize anything more than about 3.5 GB using a 32 bit OS version. To use the 8 and 16 talked about above you need the 64 bit version.

1. I have seen MSE using that much RAM. MSE is a resource hog in terms of RAM.
2. You get a lot of hard page faults. That is a sign that you do not have enough RAM. If you can, add 1GB - even 2GB although your 32bit system will not be able to use it all.
3. Unfortunately you did not show the color bar of Resource Monitor. That would have been more telling.
4. Restarting the PC is not a good idea. You loose the cache, so makes the system run slower at first.

One stupid opinion,try to uninstall the MSE with Revo Uninstaller,and install it again.

I am on a system with 2GB of ram and it is using about 28% of the ram,

Hi
I have 4GB ram in my system and with things running like IE WMP it use around 35%

Yeah - I'm guessing something on that box has triggered MSE for some reason. Best to remove, make sure you're working properly after removal of MSE (disconnect from the internet or your home network after uninstalling, to be safe, if you're paranoid), and then reinstall to see if the problem returns.

my main rig uses 24% after 2 days of running, Firefox with 10 tabs, Outlook 2010, Steam, and a bunch of other little apps and gadgets running.