I checked the services and Windows installer was missing. How do I get it back?Ben B Reade

You could try system restore back to an earlier date. If you have the Windows 7 DVD you can try a system repair by booting from the DVD and choosing repair my computer.

You can download the Windows Installer service REG fix from Misc Registry Fixes (Item #6)Ramesh Srinivasan | The Winhelponline Blog Microsoft MVP, Windows Desktop Experience

This was the first good answer I have received in three weeks. Thank You so Much. KUDOS!! It was fixed in less than 5 Minutes. Great Job... Ben B Reade

This was the first good answer I have received in three weeks. Thank You so Much. KUDOS You're welcome Ben.Ramesh Srinivasan | The Winhelponline Blog Microsoft MVP, Windows Desktop Experience