Need4search.com is a redirect virus designed to infect users' browsers 
and controls their browsing direction. Once the redirect virus breaks into the 
target computer, it alters s the browser settings without permission and never 
allows users to change them back. After the changes take effect, users will 
notice that the default homepage has been changed to another one without any 
permission. When users start to run their infected browsers or do a search, the 
threat may force them to visit certain specified websites and use it as their 
search engine. It may perform a lot of spiteful actions in the background for 
commercial purposes. 
Commonly, Need4search.com takes the innocent users to specific 
advertising sites that can be misleading at best, deceptive at worst. Owing its 
characteristic of hijacking browsers, this redirect virus has been used by the 
cyber hackers to make great profits. Innocent computer users are usually trapped 
by the irremovable ads bombards provided by Need4search.com, which are typically 
designed to make money. It should be noted that the ads provided by the redirect 
virus may not be 100% trusted, and users should just take a look and close the 
windows immediately. 
Need4search.com should be deleted from the computer immediately once 
found. Your screen will be also full of various pop-up ads, error messages and 
security alerts to interrupt you every few seconds. However, it has been proved 
that delay removal of this unsolicited search engine can bring much trouble. The 
system has been already under the total permanent control of this threat since 
the computer is compromised. Some changes can weaken the system' defenses and 
thus additional malware would grasp the opportunity to break into the infected 
computer easily. If that happens, the computer system will face lots of problems 
such as PC performance degradation. If users just ignore the redirect virus, 
they may put their system at risk and end up being victims of identity theft. To 
protect user's private data and essential parts of the system, it is suggested 
to remove Need4search.com as soon as possible once it has been listed on the 
system security scan result. 
How to Eliminate Need4search.com Redirect Virus Totally?
Step 1 Uninstall Need4search.com relevant programs from Control PanelWindows 7/Vista
Open the Start Menu -> Control Panel-> Uninstall a Program-> Find dubious program -> click Uninstall.
Windows 8
Go to Start Menu-> Control Panel-> Enter programs and features in the search box-> tap Programs and Features-> Highlight target program- > Uninstall it.
Step 2 Remove malicious Extensions from Your IE/Chrome/Firefox
Google Chrome
Click Chrome Menu -> Tools -> Extensions ->Find related add-ons and delete them.
Internet Explorer
click the Tools -> click Manage add-ons->Toolbars and Extensions ->Select unwanted add-on and click Remove button.
Mozilla Firefox
Click on the menu button at the top right corner to open Menu > Add-ons > Choose related extensions ->click Disable or Remove button
Step 3 Repair the homepage and search engine.Google Chrome
Go to 'Wrench or 3-Bars icon' > 'Settings' > 'Appearances'> 'Show Home button', click on the Change button to change your browser homepage.
Go to 'Wrench or 3-Bars icon' > 'settings' > 'Manage search engines.
Make google.com as your default search engine and click on the X to remove the unwanted URL.
Internet Explorer
Open IE and go to 'Tools' → 'Manage Add-ons'.
Choose 'Search Providers' → choose the search engine you used before and make it your default search provider. Additionally, select 'Search.searchgrm.com', remove it.
Go 'Tools' → 'Internet Options' and select 'General' tab. Click 'Use default' or enter your own website name, google.com or other. Finally, click 'OK' to save the changes.
Mozilla Firefox
Go to Navigation Toolbar > click on the Manage search engines > find the unwanted search engine> Remove it then click on the OK button to save the changes.
4 Go 'Tools' → 'Options'→ 'General'. Finally, reset the startup homepage or change Need4search.com to google.com.
Conclusion
Need4search.com is a fake site that can make your computer chaos and 
even unusable if you don't get rid of it promptly and fully. Manual removal as 
mentioned above, it is only for the advanced PC users who can handle the 
process. Malware (include redirect virus, Trojan horse, adware, worm, etc) like 
to utilize the system vulnerabilities and internet flaws to infect users' 
computers. So, users should be very cautious when surfing on the internet so as 
to avoid malware infections. As the redirect virus often comes bundled with free 
third-party applications on the Internet, users should be more cautious when 
they download and install free programs because some freeware may be malware or 
embedded in suspicious applications and harm the computer systems once 
installed. Moreover, it is suggested to pay attention to system functioning as 
well as system security services which are typically used to protect the system 
from any cyber attacks. If you need to quickly get rid of Need4search.com, use a 
professional malware removal tool.