I cant find outlook express in windows 7

You cannot find Outlook Express in Windows 7 because Windows 7 does not include Outlook Express. You have to get either a third party Email Client or you can download Windows Live Mail from Microsoft. Windows Live Mail is a part of Windows Live Essentials. You can download Live Essentials as a complete package or just install the components you want.

As above, you need Windows Live, or Thunderbird etc.

And if, like me, you want something similar to OE you have to buy M'soft Outlook. It's normally part of the Office Suite but you can get stand-alone versions.