Many programmers work hard on their programs, but act as if they don't know the first thing about uninstalling. Their programs officialy uninstall, but "unofficialy" leave useless junk behind that piles up and clobbers your system. Actually, sometimes - using the excuse that there's no official installation - they don't even bother including an uninstaller, even if they know their programs modify the registry, etc. (let's call it an unofficial installer).
Inctrl is a great freeware program, which lets you install suspicious (ok, every) program you want, so you can get a detailed report of all the changes it made in your system, because as we all know, many programmers write crappy uninstallers, which won't remove some or even many of those changes.
In Israel, many people use this modem for ADSL connection. Unfortunately, if you upgraded yours to be a router, and you use its built-in firewall, then you know what a pain it is to open/close ports. That is because the only way to do it is via Telnet. In addition, you have to deal with only one port at the time. Unless you use this!