Hi guys:
I realized de que many programs, when installed, leave in your PC some kind of a marker or something, for the program to be able to recognize for how long the program has been installed, or if THIS has been installed previously. My guess is that such a "MARKER" is an item that is installed in the REGISTER or such.
Questions:
(1) Does somebody know how to recognize which items in the register, has been installed by which programs?
(2) Does somebody know, how to uninstall these items without screwing up the system itself?
I'll be grateful for any kind of information or help provided.

Cheers

[size=2]

You have to be extremely careful playing in the registry or you will delete files needed to run both Windows and programs. You can usually go and Google manual removal instructions for a variety of programs. Some even have uninstaller/remover utilities for them. Normally, you'll find the entries you need to remove within HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER under the software subkey. But, you still have to know where to look. Another feature in regedit is a Find function which can help you locate the files to remove. However, unless you're very comfortable working in the registry, I'd have somebody more experienced sit down with you and help.