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Windows 7 64-bit: Unable to install SQL Server Express R2 (64-bit)

I am trying to install 64-bit MS SQL Server 2008 Express R2 on Windows 7 64-bit.  It starts going through the install and then I get the following error:

TITLE: Microsoft SQL Server 2008 R2 Setup
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The following error has occurred:

Could not open key: UNKNOWN\Components\1FA18F7974E099CD0AF18C3B9B1A1EE8\37954E682535F9341A51E2E84E4D1004.   Verify that you have sufficient access to that key, or contact your support personnel.

For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft+SQL+Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=10.50.1600.1&EvtType=0xF45F6601%25401201%25401

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BUTTONS:

OK
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I have delete the MS SQL Server folder under Program Files as well as clean out the registry.
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Anthony Perkins
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Thank you.  This was very good information.  I will try this in the morning.
Awesome.  I was able to get pass this error and get it install on my development bench.  I pulled the exact same installation file to our test bench and now I am getting Error 27502.  Could not connect to Microsoft SQL Server.  The login is from an untrusted domain and cannot be used with Windows authenication. (18452).  Any ideas?
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My sa user is already created. I was able to login into the database as sa. What I ended up having to do was add a dword to my registry to disable loopback. And it worked
Thank you for all of your help.