Printing editor?

On my pc I have Adobe photoshop , Picasa2 and Seriff Photo manager for my photos to print from. I have been shown Paintshop Pro which I think is superb (I could be wrong though)my idea is to delete all of the others and just use Paintshop Pro. My question is will I loose all my photos on my hard drive or are they all secure when I delete the others or could I just put PaintshopPro and carry on with it . By removing the others would my pc run faster? Thank you