PSE12 with LR3

Hi all,

I am a mad keen photographer and lately I decided to upgrade my Photoshop Elements package to Photo Shop Elements 12.

I uploaded PSE12 successfully to my laptop, but then my Lightroom 3 package would not run, it just seized up.

So I uninstalled PSE12, LR3 runs fine, so what am I missing here?
Are the two compatable?

I get the feeling that maybe I need to upgrade to Lightroom 5 to be able to run PSE12.

Any help would be appreciated.


Regards

Barry H