Applications crashing all over

Hi,

I wasn't sure where to post this message, but since its on this operating system and happening to a lot of apps, its best to put here.

Since I had this Mac Air its been perfect and worked very well with what I've been needing.

But in the last week or two - I think due to an update. Safari, Google Chrome, Shockwave, Java, iTunes and Photoshop CS6 all keep crashing on me.

iTunes just loads up then within 2 or 3 seconds brings up the crash report everytime.

Safari and Chrome do just about the same thing. But they only crash now and again - shockwave crashes when I'm viewing multiple sites that use flash player and java the same.

These all did work fine up till a few weeks ago.

My only solution that I can think would be to do a complete reinstall, but don't really want to do that.

So any help would be grateful.

The funny thing is - I don't seem to have the same problems on a Mac Mini.

Thank you