MacBook Pro 2011 10.7.5 frequently hanging programs and freezing.

For over a week my system has frequently been hanging all its programs and then spinning the beach ball of death when you try and click around or repeat actions. It happens always after it’s been woken up and then later too.
-It sorts itself out but after about 5-10 minutes.
-A couple of times I've woken it from sleep mode but the screen never wakes up, the light isn't snoozing anymore but it's all black. That never recovers and I have to force shut down.
-Occasionally while it's hanging, the sound from a browser carries on even though the screen has frozen- within a few minutes that stops too.
-I haven't made any significant changes recently and it's not associated with any particular program; it can happen through anything.
-Here are the specs and more information:
I'm usually running several programs but none with a really high activity usage. My activity monitor usually looks like this, it fluctuates, but never anything above 12-15%:
I use a 1TB external hard drive to back up Time Machine, never had any problems with it.
What I've tried:
-I've run Disk Utility (Verify Disk and Verify Disk Permissions) on everything listed and it's found no problems (except on a disk I've ejected and still had problems since, see Changes below)
e.g.
-Checked Activity Monitor to check nothing's running like crazy.
-I've run Sophos Anti-Virus software over everything and it's found nothing
-Cleared the cache and emptied the trash
-Restarted numerous times after applying any changes.
-Look for MacKeeper or MacProtector but haven't got such malware.
-Got rid of any Damaged Files from Devices: Macintosh HD and emptied trash
-Deleted The Sims 2.app and all related folders (see below) and restarted (which never actually started so I had to force shutdown again and restart.
- Installed and ran Memory Cleaner app, which freed up some memory. But problem still occuring.
Any recent changes:
Nothing major; racking my brains I can think of:
-I've had iPhoto open more freqently than usual, but even when it's closed and after restarting I'm still getting the hanging programs
-I had The Sims 2 disk in, and started the program once, it worked fine. When I was running Disk Utility it found an issue regarding an 'unused node', but it couldn't repair it. So I ejected the disk (which took a minute to respond), and have still had the problems after rebooting.
-A month or so ago I had a significant problem on Disk Utility so I had to reinstall Mac OS X, Lion 10.7.5. But it has still worked fine since then until a few days ago.
Please help!

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