**** 4Gb RAM (1.09Gb available).*****
What is the ram installed? From your statement of your specs it sounds like you have a computer capable of 4gb but only have 1 gb on the mother board of your computer.
If you go to the task manager or what ever it is called in Windows 7 and look at the performance page it will tell you the amount of physical ram available to the system.
It could be that you have 4 gb installed but for some reason the computer is only recognizing 1gb