When I dbl-click on pngsetup.exe I get a Pack and Go
Setup message saying "unable to read PRES0.ppz. Make
sure that the file exists and you have read permission
for it".
Is this a presentation that someone sent to you? It's possible that the
file has become corrupted and needs to re-sent. Right click it and select
Properties and check to see if Read Only is checked. On the other hand, are
the files on a CD? If so, save them to hard disk, change the Read Only
setting and try again.