You need to hit Control+Alt+Delete and Start Task Manager - then go to Processes and click on the top of the column titled Memory which will sort it - this will show you what is open and enable you to see what is consuming your memory. You can also click on the tab called Performance and then click on the "Resource Monitor" button at the bottom. On the window that pops up click on the memory tab - this will give you a graphical representation of everything that is loaded into the memory and how much of the RAM it is using. If anything is unusually high it may have issues - I've seen Windows Media Player do some weird things which ended up consuming all of the available system memory . . . . you can report back on anything odd