I have lost some Karaoke songs

[Ramblin]

I have a desk top computer in my office that I have an older version of Hoster on. I use it to rip my CDG's into Hoster. Then I take them and copy them to an external hard drive, like I always have, and use it with my laptop to do my show. My laptop has the updated version of Hoster. When I put them in my external hard drive for my laptop and updated my data base, I lost a huge amount of songs. About 500 songs came up missing. And just recently, I ripped new CDG's and I can't even get my laptop to find them.
Is this caused by having 2 different versions of Hoster? Will it find them and fix the problem if I update my desktop Hoster?
Also, when I update Hoster on my laptop, will I lose the songs that go with my singers in the lists? Or will the new version just pick them up and keep them? I'm nervous about that. It has taken a long time to get my lists where I need them.