I beleive this spyware can update it's code by downloading updates from your computer toi the internet thus making it extremely difficult to detect all traces and remove it. The guys that make this spyware are kings in the trade and do this 24/7,


cwshredder is no longer updated by the author:
Q. CWShredder isn't fixing my problem!
A. While it's been easy and even fun keeping CWShredder up to date, the recent variants are a living hell. The people who wrote the latest variants of the trojan surpass the older variants by far.
- Resident DLLs from the about:blank, res://xxxx.dll or invisible variants cannot be removed by CWShredder or HijackThis.
- Variants like f0r0r that are protected by Hacker Defender cannot be removed by CWShredder or HijackThis.

Q. When will CWShredder be updated again?
A. It won't be again, probably. I have a few bugs to fix, but after that there's not much left to do - I simply do not have the tools to remove the latest variants, they are too agressive or complicated to allow automated removal by CWShredder.

hey, read The CoolWebSearch Chronicles here.

also use this to protect yourself,

BugOff:
This little app disables a few exploits that are commonly used by browser hijackers (including CWS), thus protecting you from infection. This does not remove an existing infection! Applicable to everyone that uses Internet Explorer. Currently at version: 1.10

gete it from this page,
http://www.spywareinfo.com/~merijn/downloads.html