pt6776,

Programs available with Limewire are notorious for being

a) infected with viruses or worms
b) freeware or shareware
c) otherwise crippled and unusable

If you choose to download programs, be sure you scan every file BEFORE opening! I haven't come across that many ISO files in Limewire. I can't really say whether they are as risky as other file types; EXE, RAR, ZIP, etc. However, if all of the ISO files are small, then they are probably no different.

Instead of searching under programs, you could try a general search for '.iso'.
If you are sharing similar files, this may improve your chances, as you are better connected to the network.

Good Luck

Dan