Scanpst.exe is free utility tool provided by Microsoft to repair corrupted PST file. The location is this file is varies from one windows operating system version to other. You can run this tool upon getting PST file error or in case of inaccessible PST files. But sometimes the tool itself become corrupted due to some internal reasons. Major reasons behind outlook and associate file corruption are virus infection, improper application installation, improper closing of application and similar other. Any of these reasons may results into failure of scanpst.exe tool or complete corruption in outlook application. You will need to download authenticate copy of scanpst.exe file in such situation to repair corrupted PST files. But the steps are full of risk and complications. It is suggested to use professional outlook repsir software to solve any outlook issue in wiondows7 easily and automatically.