you will got this error when ever try to open any site popup box will appears “the requested lookup key was not found in any active activation context”  on windows XP. The cause of this problem is a program Internet Explorer 7 so in this post I would suggest you to follow these steps and check if the issue is resolved.

the requested lookup key was not found in any active activation context error Solution/Solved

Method 1: Install Internet Explorer 8

1. Download Internet Explorer 8.0 XP and install it and check if the issue is resolved.

Method 2: using System File Checker in Windows XP

1. Repair Internet Explorer by running the System File Checker in Windows XP.
2. Click on Start menu, click Run type sfc /scannow, and then hit ENTER. Requires Windows XP CD.
3. Now you can check if the issue is resolved.