Follow the steps in the following:
Step 1: Remove all programs related to I-beta.com redirect virus.
Click Start menu, and select Control Panel from the list.
Click on the Uninstall a program link under the Programs.
Select any redirect virus related or suspicious programs, and click on Uninstall button.
Step 2: Show all hidden files and folders.
Open the Control Panel and then click on Appearance and Personalization link.
Locate Folder Options link and click on it.
In the pop-up window, click the View tab.
Tick the “Show hidden files and folders” and non-tick the “Hide protected operating system files (Recommended)”.
Click the OK button to save the settings.
Step 3: Delete all files and registry entries related to I-beta.com redirect virus.
Open Local system disks, find out and delete all redirect virus related files.
Press Windows key + R key.
Type “regedit” into the pop-up box, and click OK button.
In the registry editor, search for entries related to the redirect virus and delete them.
Step 4: Remove the I-beta.com related add-ons from your browsers.
Open Internet Explorer, click Tools > Manage Add-ons.
Look for any add-ons related to the redirect virus and remove them
Open Google Chrome, click on the menu icon (top right corner) and select “Tools” > Extensions.
Look for any add-ons related to Astromenda.com redirect virus and click the trash icon on the right to delete them.
Open Mozilla Firefox, click on the menu icon and select “Add-ons”.
Look for any add-ons related to the redirect virus and delete them.
For detailed information, you can read this post: http://www.vblaze.com/remove-i-beta-com-within-clicks-of-mouse/