Can’t open ASP pages

I cannot open ASP pages from my IIS. It can open html pages, but can not open ASP pages. The "event viewer" says:

Event type: Error
Event origin: COM+
Event Category: Executive
Event ID: 4205
Date:  20/10/2003
Time:  13:42:22
User:  Not available
Computer: ARG-NOC0
Description:
The COM+ services could not be initiated due to an error in the system's API detailed below. Usually happens because of the lack of resources in the local machine.
CryptAcquireContext
Process name: dllhost.exe
Process ended because of severe error.
Error code = 0x80090017 : Provider type not defined.
COM+ services Internal Information:
File: .\security.cpp, Línea: 617

The text above was translated (from the original in spanish). Please, don't take it as a quote. TIA.