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Process name: Web Site Monitor
Product: Microsoft® Windows® Operating System
Company: Microsoft Corporation
File: webcheck.dll
Security Rating:

webcheck.dll (Web Site Monitor Dll) - Details

Webcheck.dll is required by windows and is used for monitoring web sites. If webcheck.dll is unavailable, windows will not function correctly.

webcheck.dll is flagged as a system process and does not appear to be a security risk. However, removing Web Site Monitor Dll may adversly impact your system.

The Process Server database currently registers webcheck.dll to Microsoft.

This is part of Microsoft Windows.

"webcheck.dll" is used for web site monitoring by Internet Explorer.
But there are some worms and virus which replace webcheck.dll. See:
WORM_MYDOOM.K - trendmicro.com
MyDoom / Novarg - symantec.com

Note: Any malware can be named anything - so you should check where the files of the running processes are located on your disk. If a "non-Microsoft" .exe file is located in the C:\Windows or C:\Windows\System32 folder, then there is a high risk for a virus, spyware, trojan or worm infection!