I have installed vs.net 2005 in my computer just now and there is no something which indicates the work flow foundation is available. So I downloaded the file of " Visual Studio 2005 Extensions for Windows Workflow Foundation Beta 2_2(EN).exe" from http://www.microsoft.com/downloads/details.aspx FamilyId=5C080096-F3A0-4CE4-8830-1489D0215877&displaylang=en. But the product code is required to install it. could you tell me the product code or another way to have the wff available. Thank you!

Could you tell me how should I do to enable the work flow foundation can be used?:
WinL
The screenshots don't help, but the comment you made when you sent them might be a good hint. You must have a fully licensed version of Visual Studio 2005 to install. Trial or Express editions are not supported.
Taffy III
Sajaki
Thivya
qubits
Here is the part of the information anbout vs 2005 from the menu of "about Microsoft Visual Studio" :
Microsoft Visual Studio 2005
version 8.0.50727.42(RTM.050727-4200)
Microsoft .NET Framework
version 2.0.50727
juanazo
Nelson Alembedayo
In the process of the installation,there was no obvious error occured.I am going to describe this process,may be it is useful for your helping to me.
After the double click on the file of "Visual Studio 2005 Extensions for Windows Workflow Foundation Beta 2_2(EN).exe",a small window with a process bar and a title of "WinZip Self-Extractor-Visual Studio 2005 Exte....." came out. "Installing Visual Studio 2005 Extensions for Windows Work Flow Foundation Beta 2_2(EN)" is between the title and process bar.
After the process bar finished,a new small window came out which required me to enter the product code.I tried several ,but they were invalid.
If picture can be pasted in this forum,it will be easy.And thanks for you help.