Updating permission setting for folder 'C:\Program Files\Microsoft SQL Server\100\DTS\' failed. The folder permission setting were supposed to be

Why am I getting the following error when installing SQL 2008 Developer Edition on Win 7 Ultimate?

I am logged in as administrator on this PC and SQL Services were configured to run under NT Authority/Network Service.

TIA.

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

Updating permission setting for folder 'C:\Program Files\Microsoft SQL Server\100\DTS\' failed. The folder permission setting were supposed to be set to 'D:(A;OICI;FA;;;BA)(A;OICI;FA;;;SY)(A;OICI;FA;;;CO)(A;OICI;0x1200a9;;;BU)'.

Click 'Retry' to retry the failed action, or click 'Cancel' to cancel this action and continue setup.

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=0x88792597%25400xD69AB41D

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BUTTONS:

&Retry
Cancel
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and when this happens, I cannot get out of setup by clicking on retry or cancel.  Setup tries to do its thing and comes back with same dialog.