Thanks,1.8gb/8gb is great i use 7gb/8gb so you shouldn't worry your computer is fine
also checking how much ram you are using, uses ram
Plan to get one later.Are you having Graphics Card ?
I've done that before and see no useless processes, All the processes that are running are no way near 1.8gb.Uninstall useless Programs and Update your AntiV. and Run a Full System Scan..... Some Virus might be Eating your Process.... or Start Task Manager Processes and Below Memory (Private Working Set) see which is eating your Process...