This is the Premiere PRO forum... you need to ask in the forums for the products you are going to buy
Photoshop Elements Forum http://forums.adobe.com/community/photoshop_elements
Premiere Elements Forum http://forums.adobe.com/community/premiere_elements
Go to http://forums.adobe.com/index.jspa to find a lightroom forum
[Moved to Premiere Elements forum.]
Best go the tryout route of these programs from Adobe (one at a time or altogether) before any purchase to check out the compatibility and stability of these program with your computer environment.