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Thanks so much for your help. For now, this seemed to have solved the problem and found all the infected files. I'll keep you updated, as I know this virus can be very hard to kill.

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Adware.CDNHelper

Aliases of Adware.CDNHelper (AKA):

[McAfee] Adware-CDNHelper
[Other] W32/CNNIC.A, BrowserModifier:Win32/CNNICChineseKeywords, Adware.WSearch, Win32/CNNIC

How to Remove Adware.CDNHelper from Your Computer

To completely purge Adware.CDNHelper from your computer, you need to delete the files and folders associated with Adware.CDNHelper. These files and folders are respectively listed in the Files and Folders sections on this page.

For instructions on deleting the Adware.CDNHelper files and folders, see the following section How to Delete Adware.CDNHelper Files (.exe, .dll, etc.).

How to Delete Adware.CDNHelper Files (.exe, .dll, etc.)

The files and folders associated with Adware.CDNHelper are listed in the Files and Folders sections on this page.

To delete the Adware.CDNHelper files and folders:

Using your file explorer, browse to each file and folder listed in the Folders and Files sections.
Note: The paths use certain conventions such as [%PROGRAM_FILES%]. These conventions are explained here.
Select the file or folder and press SHIFT+Delete on the keyboard.
Click Yes in the confirm deletion dialog box.

IMPORTANT: If a file is locked (in use by some application), its deletion will fail (the Windows will display a corresponding message).You can delete such locked files with the RemoveOnReboot utility. To delete a locked file, right-click on the file, select Send To->Remove on Next Reboot on the menu, and restart your computer. You can install the RemoveOnReboot utility from here.

Files:

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Scan your File System for Adware.CDNHelper

Adware.CDNHelper Categorized as:

Adware

Software that is designed to launch advertisements, frequently pop-up ads, on a user’s computer and/or to redirect search results to promotional Web sites. Adware programs are often built into freeware or shareware programs, where the adware creates an indirect ‘charge’ for using the free program. Sometimes a trojan can silently download an adware program from a Web site and install it onto a user’s machine.

Hacker tools, or Browser Hijackers, can also download an adware program by exploiting a web browser’s vulnerability. Browser Hijackers may tamper with the browser settings, redirect incorrect or incomplete URLs to unwanted Web sites, or change the default home page. They can also re-direct a user’s searches to “pay-to-view” (often pornographic) Web sites.

Typically, many adware programs do not leave any marks of their presence in the system: they are not listed on Start | Programs; they add no icons to the system tray; and they don’t show up on the task list. In addition, adware programs seldom provide an uninstallation procedure, and attempts at manually removing them frequently result in failure of the original carrier program.

Downloader

A type of trojan. The primary purpose of downloaders is to install malicious code on a user’s computer. However, they can enable other malicious uses. For example, they can be used to continually download new versions of malicious code, adware, or “pornware.” They are also used frequently used to exploit the vulnerabilities of Internet Explorer.

Downloaders are typically written in script languages such as VBS or JavaScript.

How Did My PC Get Infected with Adware.CDNHelper?

The following are the most likely reasons why your computer got infected with Adware.CDNHelper:

Your operating system and Web browser's security settings are too lax.
You are not following safe Internet surfing and PC practices.

Downloading and Installing Freeware or Shareware

Small-charge or free software applications may come bundled with spyware, adware, or programs like Adware.CDNHelper. Sometimes adware is attached to free software to enable the developers to cover the overhead involved in created the software. Spyware frequently piggybacks on free software into your computer to damage it and steal valuable private information.

Using Peer-to-Peer Software

The use of peer-to-peer (P2P) programs or other applications using a shared network exposes your system to the risk of unwittingly downloading infected files, including malicious programs like Adware.CDNHelper.

Visiting Questionable Web Sites

When you visit sites with dubious or objectionable content, trojans-including Adware.CDNHelper-, spyware, and adware, may well be automatically downloaded and installed onto your computer.

Detecting Adware.CDNHelper

The following symptoms signal that your computer is very likely to be infected with Adware.CDNHelper.

PC is working very slowly
Adware.CDNHelper can seriously slow down your computer. If your PC takes a lot longer than normal to restart or your Internet connection is extremely slow, your computer may well be infected with Adware.CDNHelper.

New desktop shortcuts have appeared or the home page has changed
Adware.CDNHelper can tamper with your Internet settings or redirect your default home page to unwanted web sites. Adware.CDNHelper may even add new shortcuts to your PC desktop.

Annoying popups keep appearing on your PC
Adware.CDNHelper may swamp your computer with pestering popup ads, even when you're not connected to the Internet, while secretly tracking your browsing habits and gathering your personal information.

E-mails that you didn't write are being sent from your mailbox
Adware.CDNHelper may gain complete control of your mailbox to generate and send e-mail with virus attachments, e-mail hoaxes, spam, and other types of unsolicited e-mail to other people.

Check now if your PC is infected with Adware.CDNHelper

Also Be Aware of the Following Threats:

Adware

Downloader

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