OS 10.3 - OS Troubles

Hello there. I'm running an old B&W G3 with OS 10.3.

I've got the problem that when I do any updates it messes up programsd like Limewire (Programs the connect to the internet without the use of internet Browser such as Safari or Explorer)

I've got a few of these including Poker Sites such as Busgysclub and none of them will work once I update anything. I updated Quicktime the other day to QT7 and suddenly these didn't work. I can not ever reinstall them. The install program will not run.

It doesn't matter if I do a security update of a program update.

I've have to reinstall my OS to get these programs to run again. I've tried all the repair programs on untilities (Permission and disk repair) and it didn't help.

Let me know if you have any idea's!

Thanks

Jeff