How to remove ads by iTunes Error 4900 virus.

The iTunes Error 4900 virus is a nasty adware that promises to bring you free coupons and discount vouchers so you would save money when shopping online, but that is just a lie told by hackers. The iTunes Error 4900 is actually created to deliver commercial advertisements to more and more online users. Because this malware uses unfair methods to advertise commercial ads, it is classified as spam spreading agent. It is advised to block the iTunes Error 4900 ads and all of its malicious processes to protect the system from harms.
Disadvantages and risks of having iTunes Error 4900:
It may change & corrupt default settings of browsers like Firefox, Chrome or Internet explorer
Changes home page and displays unwanted pop-ups advertisements
Causes frequent web redirects to wrong websites, hijacks search engine settings and leads to unexpected webpages
Keeps record of browsing activities and interests
Collects Personal user information which may include sensitive financial data such as logins, usernames, accounts
It may bring further infections are direct the user to infectious sites
Makes the browser run slow, uses a big part of system resources

Want to get rid of Browser Hijack iTunes Error 4900?:
To manually remove iTunes Error 4900, follow the instructions.
First of all, Uninstall the program. (Skip to the next step if the application is not listed in Control Panel).
“Start > Settings > Control Panel. Now Locate and open “Add or Remove Programs” or “PROGRAMS AND FEATURES”. Find “iTunes Error 4900”. Now click Uninstall/Remove.
Now remove the program from Browser.
Internet Explorer users:
Click “Tools” (if on Internet Explorer 9, click gear icon), Then “Manage Add-ons”. Look for iTunes Error 4900. Disable if found any.
Block iTunes Error 4900 pop-ups
To stop pop-ups from malware,
Click on TOOLS > POP-UP BLOCKER, then click TURN ON POP-UP BLOCKER. and then go to POP-UP BLOCKER SETTINGS. (Type any website you wish to block popups from)

Firefox users:
Go to “Tools” (at the top), > “Add-ons” > “Extensions” and disable “iTunes Error 4900”

Chrome Users:
Click “Tools/Settings” (Wrench incon), > “Add-ons” > “Extensions” and disable any file associate with malware.

Still Spyware iTunes Error 4900 lurking in the system? Remove manually
Stop processes of this malware:
Open Task Manager to stop processes.
Remove associated registry settings:
HKEY_CLASSES_ROOT\urlsearchhook.toolbarurlsearchhook
HKEY_LOCAL_MACHINE\software\classes\urlsearchhook.toolbarurlsearchhook
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Toolbar
HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Firefox\extensions,
HKEY_CURRENT_USER\software\microsoft\internet explorer\toolbar\webbrowser
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run “.exe”
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings “WarnonBadCertRecving” = ’0
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop “NoChangingWallPaper” = ’1
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments “SaveZoneInformation” = ’1
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System “DisableTaskMgr” = ’1
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download “CheckExeSignatures” = ‘no’
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main “Use FormSuggest” = ‘yes’
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced “ShowSuperHidden” = 0
Delete iTunes Error 4900 infected files:
%Profile%\Local Settings\Temp\
%ProgramFiles%\
%UserProfile%\
System restore:
Have you tried methods above but still malware not removed? Then try Restoring your computer to an earlier state.
Click Start menu > All Programs > System Tools > System Restore
or Start menu > Backup and Recover > Recover System