Note that many websites have their own advertising, unrelated to adware.
Adware is any software application in which advertising is displayed while the program is running. The authors of these applications include additional code that delivers the ads, which can be viewed through pop-up windows or through a bar that appears on a computer screen and sometimes through text links or in integrated search results. Adware may or may not track personal information. It may also gather information anonymously or in aggregate only. Users should check the EULA and Privacy policy to ensure if the adware on their machines conforms to their standards.
Official
Description:
LinkReplacer is an Internet Explorer Browser Helper Object that adds content to the start of every web page viewed.
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This content is (currently) a script that reads all your cookies and sends them to LinkReplacer's controlling server wcft.net.
Cookies set by web sites (and sent by LinkReplacer) may contain personally identifying information.
Cookies are also often used for authorising access to web sites. LinkReplacer's owners will often be able to gain access to your accounts on web sites you have accessed with it loaded.
Manual
removal:
Open a DOS command prompt window (Start->Programs->Accessories) and enter:
cd "%WinDir%\System"
regsvr32 /u iehelper.dll
Restart the computer and you should be able to delete the file 'iehelper.dll' inside the System folder (inside the Windows folder; called 'System32' under Windows NT/2000/XP or 'System' under Windows 95/98/Me).
You might also want to change the passwords on web site accounts you have that LinkReplacer may have compromised.
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