anybody can help me of how i can access the registry key of windows to application??

You use My.Computer.Registry.GetValue. For example

Dim key As String = "HKEY_CURRENT_USER\Software\Helios\TextPad 5\Recent File List"
Dim name As String = "File3"

MsgBox(My.Computer.Registry.GetValue(key,name,Nothing))

the registry can be a very dangersous place ,you can corrupt windows very quickly.

I could tellyou how , but so as you don't blame me ,ill ask you to be more specific as to what you want to do ,as this actually doesn't make full sense

the registry key of windows to application

or read a bit here ,good luck
http://lmgtfy.com/?q=accessing+the+registry+

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