Use task manager to see if you can find what is using all your memory
could be a crappy program with a memory leak
In task manager which process its using all the memory?
That is something I forgot to mention:
There doesn't seem to be a process with huge memory consumption. Google Chrome sure takes a lot of memory. Right now I have 5 tabs opened and 12 chrome.exe process are shown in Task Manager, but there are a lot of different processes.
If you want to take a look...