I recently installed the TweakNow PowerPack 2011 for Windows 7, and I ran it and applied the suggested optimizations. Soon after that I began getting Windows messages saying that my system was low on memory and programs (Chrome and Steam) started crashing. I have owned this computer for over a year and this has never happened with the exact same set of programs (or more) running. I don't know what I changed to cause this, but I checked that the RAM optimizer is disabled. What should I do to fix this problem?
EDIT: I cannot reproduce the problem anymore, so I will post an answer with what I think the solution was when I can. (In other words, I cannot judge if an answer is correct).