It seems that these .PNG images are being uses more and more lately on
the web. They normally load fine in a web browser, but if I save them,
and try to open them in a graphics editor, they either dont loadf at
all, or load and are all scrambled.

I dont have the latest graphic editing software (nor do I want it,
because most is too bloated).

What I do have, is
Photoshop 5.x
Paint Shop Pro 4.x
Paint Shop Pro 7.x

I'm running these on either XP or Win98se.

I can load .GIF, .JPG, .PCX, .BMP, and many other formats, with no
problems.

But these .PNG files can and mostly do load in some scrambled manner, or
wont load at all.

Is there some free software I can download that will convert these
images to another format? (BMP or PCX is my desired format choice,
because JPG is too lossy for editing). Batch conversions would be
preferred, but even if I have to do them one by one, that's ok.

The software needs to run on XP (Or Win98). I dont have anything newer.