LimeWire doesn't do anything to computers unless it is running. Having it installed isn't going to cause any problems.

LimeWire uses Java to run - that is all. You may want to download a fresh version of Java and re-install.

You may find that it is a good idea to find an up-to-date virus checker and sweep your system.

If advertising programs are causing you a problem, go to www.lavasoft.de and get Ad-Aware (don't worry - the site is in english (the software supports multiple languages)).

Beyond that - you could find a registry editor to clean out the registry (be careful - don't do it if you don't know what you are doing).

The LimeWire files are stored in c:\program files\LimeWire by default - you can delete this folder.

Mark