Can't open pictures

I'm having trouble opening pictures (jpg's) using my Windows Explorer. One of
two things happens.

The first problem is that I tried to open some pictures from a CD that
contains a couple of dozen jpg's. Explorer showed only four jpg's on the
drive and I can successfully open those. (I have been able to open all of the
jpg's on my laptop from work with no problem.) So, how do I fix this so that
Explorer will show all of the jpg's? Also, in the past when I've tried to
load pics onto a CD to burn, only a handful of them will go. Do I need to
change my memory or update s/w?

The second problem starts when I try to open a jpg from a CD (usually by
double-clicking the item). When I do this, Explorer "searches" for the item
but then reports "No preview available" and the jpg will not open. Again, is
this a memory shortage?

Thanks for any help. Please reply to "grace1st@peoplepc.com."

--
God bless,
Scott