I sent you several links directly to MS site to Download installer. v4.5 .
I also sent you the direct link to "How to repair Windows 7 Corrupt Installer from the MS site.
Download the installer for all versions of Windows
The following file is available for download from the Microsoft Download Center:
Collapse this imageExpand this imageDownload the Windows Installer 4.5 Redistributable package now. (http://go.microsoft.com/fwlink/?LinkId=120486)
You can find all the available Windows Installer redistributables at the Microsoft Download Center.
The download for the Windows Installer 4.5 redistributable package is available at: http://go.microsoft.com/fwlink/?LinkId=101159.
The information in this topic identifies the additions and changes that are available in Windows Installer 5.0.
Windows Installer 5.0 is available for Microsoft Windows 7 and Windows Server 2008 R2. For a complete list of all Windows Installer versions and redistributables, see Released Versions of Windows Installer.
The RTM release of the Windows SDK for Windows 7 and .NET Framework 3.5 SP1 is now available for customers to install from the download center in both ISO and Web Setup format. See the SDK announcement on the Windows SDK blog.
Please note that the stand-alone version of the Windows Installer 4.5 SDK is now no longer available for download from the Microsoft download center. Windows Installer SDK has traditionally always been included with the Windows SDK, but during the timeframe for the release of MSI 4.5 redistributable there was no other Windows or Windows update release for simultaneously shipping the SDK.
We encourage you to download and use the latest version of the Windows Installer SDK tools (Windows Installer 5.0) included with the RTM release of Windows SDK for Windows 7.
Now if the REGedit suggestion by javajolt did not work, nor the method stated by MS or the new install from microsoft. you only have 1
option left....
insert the DVD for Windows 7 or start from HDD and do a clean install... first I'd make sure the DL edition you are -were using is verified by hashcheck to insure it is 100% complete.
javajolt should be able to provide that info.
Apparently for some reason you original install was not 100% - I suggest this due to Acronis on my edition of Win7 is working 100%. where you stated your edition was not working properly...
Other than that I'm out of suggestions.