Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependenc

Ok I Don't know how it's working now for me but here what i did....
1. Install the latest Asp.NET Ajax
2.Open my web.config in my production server and replace this line

by

It's the same thing but the PublicKeyToken is in capitals....
Save it and browse to my site and bingo!
Hope this help...

SQL Developer Installation Error

The application failed to initialise properly (0xc0000018). Click on OK to terminate the application

The set up is for x32. It wont work in 64 Bit Os. Get a setup which suits for x64

Unable to find the requested .NetFrameWork Data Provider. It may not be installed.

Problem is that, your Operating System will be of 64 bit. x64.