Determine whether service packs installed on the .NET Framework

With the .NET Framework 1.1, a new registry hive has been created specifically to make it easier to find the service pack level.

Start Registry Editor, and then locate the following registry key:

Key Name: HKEY_LOCAL_MACHINE\Software\Microsoft\NET Framework Setup\NDP\v1.1.4322

Value: SP

Data type: REG_DWORD

The data in the SP value tells you which service pack is installed for the .NET Framework 1.1. For example, if the value of SP is 0, no service pack is installed for the .NET Framework 1.1. If the value is 1, Service Pack 1 for the .NET Framework 1.1 is installed.Note that this method cannot be used to detect if any hotfixes are installed for the .NET Framework 1.1.