Any file extension with the .exe ending is an executable file, and should not be messed with under normal operating conditions. Deleting or altering these files will cause your operating system to become unstable, shut down, freeze up, or crash, which gives the blue screen of death.

So what is it?

Dllhost.exe is a native windows process. It works to link certain programs with specific resources, called dlls or dynamic link libraries. It's a necessary function and constitutes one of those things that Windows needs to keep a computer running right.

There are many things that can cause errors with the dllhost.exe file, and the best recommended path is to take note of the error message, visit Microsoft’s Support Center at http://support.microsoft.com/ and searching for the specific error. Microsoft is great when providing information to fix known errors. If the specific error cannot be found in the Support Center, visit Microsoft’s Discussion forums and post your question there. Other Window’s users Dllwill post answers to your questions, and will at least point you in the right direction.

Is it Malware?

To confuse users, many times malware is labeled with similar file names as legitimate ones. To be able to distinguish between a valid .exe file and disguised malware, run Windows Defender, a built-in Malware scanner available in Windows Vista and Windows 7.

• Open the main menu

• Using the search field, type in Windows defender

• Click to open

• Choose to run a full scan, and wait for results.

• Follow recommendations to remove or quarantine any malware discovered.

This check can also be done using the security suite of your choice. There are many reputable scanners available online that can do comprehensive analysis of your computer. Be sure to follow manufacturer’s instructions to quarantine or remove all malware discovered during scans. Be sure to run full scans of your computer regularly; many security suites can be set up to scan automatically, including Windows Defender. To set up scheduled scans:

• Open Windows Defender

• Open tools and click options

• Select the Automatic Scan Option

• Choose the options you want (type of scan, when performed, auto removal of infections, etc)

• Click on Save to apply your choices

If you are using another security suite, be sure to follow their instructions to set up automatic scans and how to remove or quarantine infections found.