vbc.exe is a process associated with Microsoft® Visual Studio® 2005 from Microsoft Corporation.
This issue may occur because the CPU computes lots of debug data when you build the application in debug mode. How much debug data is computed depends on the size of the project and on the number of references. In some cases, the debug data is computed multiple times.
It is essentially a safe process but since it requires substantial amounts of memory, it should be removed if possible.