How to enable FIPS on windows 7 - windows

Question

Have to test a c# application from client that is to work on a machine that has FIPS enbaled

Answer 1

First, be aware of what actually happens when you enforce FIPS140-2 complient encryption within Windows. Details are at http://technet.microsoft.com/en-us/library/cc750357.aspx. However, the main 'gotcha' (old SSL website's don't work in IE anymore) is detailed in the article linked below.
The official instructions to enable FIPS 140-2 complience are at http://support.microsoft.com/kb/811833, but can be summarised as follows:
Using an account that has administrative credentials, log on to the computer.
Click Start, click Run, type gpedit.msc, and then press ENTER.
In the Local Group Policy Editor, under the Computer Configuration
node, double-click Windows Settings, and then double-click Security
Settings.
Under the Security Settings node, double-click Local Policies, and
then click Security Options.
In the details pane, double-click System cryptography: Use
FIPS-compliant algorithms for encryption, hashing, and signing.
In the System cryptography: Use FIPS-compliant algorithms for
encryption, hashing, and signing dialog box, click Enabled, and then
click OK to close the dialog box.
Close the Local Group Policy Editor.
If you wish to do this manually, you can also simply change the registry key HKLM\System\CurrentControlSet\Control\Lsa\FIPSAlgorithmPolicy\Enabled to 1
Finally, to repeat, it is very important that you read through the documentation before you enable this - it changes cryptography system wide, including how the file system (both EFS and Bitlocker) and network (IE, Remote Desktop and the main cryptographic libraries) are allowed to encrypt, as well as if you allowed to recover lost encryption keys.

Answer 2

As an alternative, for Windows 7 users (with admin rights), this is one of the "Network Properties". Step by step:
click on the "Network" icon on task bar.
right click > Properties on the specific Network connection
switch to the "Security" tab.
click on "Advanced Settings" button.
click the checkbox labeled "Enable Federal Information Processing Standards (FIPS) compliance for this network.
Also, have in mind:
Recommended reading: http://technet.microsoft.com/en-us/magazine/ff847520.aspx
This setting sepends on what you have selected as "Security Type" on the Security Tab
Your wireless network adapter card might be doing this encryption in hardware already. This checkbox will switch from that to rather performing AES encryption in software.