How To Remove Google Custom Search Engine Virus
Remove Google redirect virus step 2: remove browser add-ons, extensions, toolbars
This is quite an involved process. Fortunately for you we have explained the process in some detail here: how to remove browser extensions and toolbars.
Remove Google redirect virus step 2: manually change home page(s)
If the virus has changed your web browser's home page to the Google search page (and you don't want that) you need to manually change it back.
Open Internet Explorer and go to Tools, Internet Options. Type http://www.pcadvisor.co.uk in the field for your home page and click Ok.
In Google Chrome click the 'hamburger' icon in the top righthand corner of the screen (it's three short horizontal bars). Go to Settings, and then scroll down to 'On start-up' and make sure 'Open a set of specific pages' is enabled. Then click 'set pages' and type in http://www.pcadvisor.co.uk (and some other inferior sites, if you must).
In Firefox, click the Firefox tab in the top lefthand corner of the window. Choose Options. Then select General, and make sure that next to 'When Firefox Starts:' the option selected is 'Show my Home Page'. Then in the 'Home Page:' field below insert http://www.pcadvisor.co.uk and that will be your home page.
Remove Google redirect virus step 3: manually change default browser and remove unwanted search engines
Again, this is an involved process, and again we have detailed information on these pages:
How to change default search engine in Internet Explorer, How to change the default search engines used by Firefox and How to change the default search engine on Chrome.
Remove Google redirect virus step 4: repair browser settings
Your web browsers should now be back in sparkling form, but let's take a belt-and-braces approach and make sure. Install the free CCleaner utility. Now go to Cleaner, Windows/Applications. Click Analyze, and when the analysis is complete click the Run Cleaner button.
Go to Tools, Startup and search through each tab. Click Disable and Delete for any entry that includes 'search' in the title or filename.
Remove Google redirect virus step 5: repair Windows host file, reset proxy settings
For almost everyone the Google redirect virus will now be a thing of the past. But if you want to be super sure that you are in the clear we recommend undertaking the following tasks.
First up let's repair the Windows hosts file - if you don't know what you are doing here, this may be something best left to the experts. But as we will explain, you can Open MS Notepad with administrator privileges, by right clicking Notepad and clicking Run as administrator. Now open the Hosts file, you'll find it here: C:\Windows\System32\drivers\etc\hosts. Before you do anything, copy the whole file and paste it into another text document that you save to your desktop, with the same filename as the Hosts file. If the changes you make mess up anythig, you can replace the Hosts file with this document.
Delete any entries that look anything like this: '000.00.00.00 botcrawl.com' or '000.00.00.00 google.com'. They'll appear as additions at the bottom of the file. Resave the Hosts file.
Finally, let's repair each browser's proxy settings so that the Google redirect virus definitely can't hijack your browser.
To do so with IE, launch Internet Explorer, and go to Tools, Internet Options. Click the Connections tab, select Local Area Network (LAN) Settings and unselect everything, press Ok. (If you are at work this is something for which you should ask help from the network admin.)
In Chrome, as before go to Google Chrome Options. Select Under the Hood, then Network, Change proxy settings. In the Internet Properties window, click the Lan settings button. Now select Local Area Network (LAN) Settings. Uncheck Use Proxy server for your LAN, click Ok.
In Firefox, hit the Firefox tab and go to Tools, Options. Press Advanced, open the Network tab, and press Settings. Select No proxy and press Ok. (Again, if you are at work this is something for which you should ask help from the net