Thats hard to say with as little information given. I was using 1.2 GB of 4 GB for a long time. The only time I would see 2 GB used, was after I had become infected with something. Then I start loading more apps and services into memory and started seeing 2 GB memory usage as a norm. I'm currently looking at 2.8 GB (35%) usage of 8 GB.
Programs? As in more than one? I see ad-aware and avast. Avast includes anti-spyware - you don't need Ad-Aware running too. Your screen shot only shows just over half the processes running. What is not shown?
SpeedUpMyPC doesn't - and eats resources while not doing it.