Q:

Visual Studio 2010, "File > Recent Projects and Solutions" is not a active ! 

I have created hundreds of project on VS 2010 but "File > Recent Projects and Solutions" section is not there !  normally, it should have been like this

but mine is like below;

as you can see, also on the start page, there is only two project on the 'Recent Projects' section which is odd given the circumstances. 
what should I do here to get it worked? 
Thanks in advance for your help. 
EDIT
here is how customize window looks;

and here is the regedit view;

A:

It seems you have two separate problems:

The "Recent Files" and "Recent Projects and Solutions" options are missing from your File Menu. 
You have a lot less Projects in your Recent Projects than you should. 

Solution To #1: Go to Tools > Customize > Commands.   From there you should be able to select "File | Recent Files" and "File | Recent Projects and Solutions".   Next, you click "Reset All".   Hopefully, you have those two lists back now. 
Solution To #2: This one is a little bit more complicated because it could be a number of things.  

First, I would make sure you have the number you want for the "Recent files" options in Tools > Options > Environment > General. 
If you already had that, check the registry location and make sure you actually have entries here since this is where VS pulls it from.   HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\10.0\ProjectMRUList . 
The 10.0 is for VS 2010.   More info here.  If there's nothing there then your recent projects aren't being saved properly. 
You could try calling Devenv /ResetSettings to reset the VS settings.  More info at MSDN. 
Finally it could be due to a Windows Explorer setting which hides recent files.  This is a possibility because VS takes its directions from the same place with regards to recent files.  You would need to make sure HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer "NoRecentDocsHistory" is zero.  More info on this possible solution as well as other ideas to this problem can be found here.