I have an Acer Aspire | M with Windows 8 64-bit, an i5 core and 8GB DDR3 Memory. Until yesterday, it was working fine, but now it keeps telling me to close programs because it doesn't have enough memory. The memory in the task manager says 6.8/7.7 in the top left, but below it says 2.3GB is in use with 842MB available. I tried rebooting, but that didn't do anything. Why isn't it using all of my RAM?