The genuine AdShield.dll file is a software component of AdShield by All Star Software Systems.
AdShield stands for AdShield Dynamic Link Library
AdShield.dll is a browser extension for Internet Explorer. This add-on enables several additional functions for Internet Explorer. You can disable it through the Extras menu (key combination Alt + X) under Manage Add-ons. The following paragraph provides more information about AdShield DLL.
Description: AdShield.dll is not essential for the Windows OS and causes relatively few problems. AdShield.dll is located in a subfolder of "C:\Program Files".
Known file sizes on Windows 10/8/7/XP are 143,360 bytes (57% of all occurrences), 208,896 bytes or 204,800 bytes.
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include 7559B76E-0222-4d77-9499-CCE9EB4EDC2F. The program is not visible. It is able to monitor web browsers. The service has no detailed description. The AdShield.dll file is not a Windows system file. Therefore the technical security rating is 66% dangerous, however you should also read the user reviews.
Recommended: Identify AdShield.dll related errors
External information from Tony Klein:
Important: Some malware camouflages itself as AdShield.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the AdShield.dll process on your PC to see if it is a threat. If AdShield DLL has changed your browser's search engine and start page, you can recover your browser's default settings as follows:Reset default browser settings for Internet-Explorer ▾
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active AdShield process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the AdShield.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.
A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.