Bad RAM memory (memory leak) on Macbook Air

I have a recent issue with my Macbook Air (2GB, 120 GB, bought two years ago, used as main laptop, upgraded to Mountain Lion 6 months ago):
Even though I run the same applications as before (Safari, Office for Mac, Calendar, iTunes, so nothing too heavy like Photoshop, Final Cut, or Autocad), I started receiving a warning message saying that there isn't enough memory to perform the applications.
I have 2GB RAM - which has always been enough for what I do. Also, my HD has 20GB of free space (from 120 GB), which also seems to be fine. It has performed well under much worse HD conditions.
I have noticed that things get even worse, when I open Office for Mac or Utilities - System Monitoring, Disk Utility (!!!)
I read that many people have faced a similar problem, and I have already tried everything that was suggested in their discussions:
- purge
- deleting calendar agent (someone said it could be caused by exchange calendars etc)
- Alt (Options)+R / Command+P while rebooting
- deinstalling Skype and Dropbox
I have just installed Memory Booster and Memory Clean from the Appstore - they automatically clean up the Inactive RAM when my free memory gets too low. This seems to have sorted things for now, but both applications have to do cleaning every 3-5 min.
Right now, with only Safari running (in addition to Memory Booster), my stats are ridiculous:
- Free: 11MB
- Inactive: 739 MB
- Active: 744 MB
- Wired: 298 MB
Virtual memory is steadily above 1GB...
I would really appreciate some help/advice. There is no apple service center in my city...
Thank you in advance!

What is the exact text of the message you are receiving?
My guess would be that your problems are twofold. First, 2 GB of RAM is bare minimum for Mountain Lion. If you were running Snow Leopard before, you will be able to do less on the same amount of RAM with Lion or Mountain Lion. If you are running all those apps you mention at the same time, you need more than 2 GB of RAM.
In addition, if your hard drive is running out of free space, you may be having an issue because of that as well. Your machine needs free hard drive space to store things like virtual memory swap files. How much space is free on your hard drive?

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