CWS works by installing bookmarks without permission or the user, as i have already said, it is near impossible to remove with normal tools, however there is now a piece of software that will remove CWS and all of its variants.

CWS shredder is an excellent piece of tech that is specifically designed to remove CWS spyware, it can be downloaded at http://www.intermute.com/cwshredder/learn_more_cwshredder.html
The program is quick and the results are displayed in an easy to understand manner, on system restart you will notice how much better your computer performs, good luck!