Something causing high memory usage

Hi. I hope my title was good and what this site would expect or find helpful.
So I have a problem and I don't know what's going. I have an HP Win7 64-Bit. AMD Six-Core 3.3Ghz & 10Gb Ram (just for info's sake). My windows experience rating is only 5.0 in Computer properties, lol. I know, One would think it would be higher.

I haven't formatted in about almost two years. I know one should try to do that at least once a year, so you always have a clean system. But it really gets tiring formating, and reinstalling everything back.
I usually run CCleaner and stuff to make sure it runs free of clutter and other stuff that might just decrease its speed. I run Ableton Live sometimes to mess around with music production, and It's lagging and so annoying now.

Here's where my problem begins. About a month ago. I noticed that while my CPU continues to remain at a normal 2-10% (Depending what's open). However, my memory use has been pretty unusually high. Constant. Like from 40%-80%. I am sorry that I really don't remember what it used to be (had no real use to look it up. I'd just look up CPU which is 1-10% normally -again, continues to stay that way).

I have that free Startup CPL program and this is what I have starting up on boot up;

KeyScrambler
SearchandDestroyTray
ZALFree Antilogger
ZoneAlarm
Peerblock
Sidebar (CPU+Memory. What I started running after this problem)
Onedrive (Now disabled)
Spotify Web Helper
Hydra Vision Desktop Manager

Thanks in advance.

you are running two different anti keyloggers, KeyScrambler and ZALFree. I'd disable both for now, then re-enable only one,if you really think you need one.

You don't need to reformat, ever. Just learn exactly what it is start > run > msconfig > startup, and start > run > msconfig > services > hide microsoft services. If those two areas of your machine are kept to a minimum, your machine will stay fast.