SD Card Recovery ----How to Recover Lost Files from SD Card?: Troubleshoot:Corrupt Windows Installer Program? Error

Corrupt Windows Installer Program?

My OS is Windows 7 64 bit.
I was uninstalling a program and the windows installer ( uninstaller) that asked to make changes to my computer was from an "Unknown Publisher".
I Regret that I clicked to allow it to make changes to my hard drive.
It removed
all of my Anti virus and internet security programs.
Windows defender is also affected (will not remain on when I turn it on). After I realized that my internet security and antivirus programs had been deleted, I turned on Windows defender and ran a scan
(that took 10 hours!), but windows defender will not remain in the on state when I shutdown my computer and restart it.
Since then, I have re-installed my internet security and anti-virus.
I ran a full scan, many files are now locked now and cannot be scanned.
I don't know how they got locked or how to unlock them! Anyone on that issue? I suspect my windows installer program is corrupt, since that is where the whole mess started.
How can I remove my present windows installer and replace it with a genuine windows
installer program?

Keys to the Problem Corrupt Windows Installer Program?

Download SmartPCFixer to Fix It (Free)

If your Internet Security software came pre-loaded with the an AntiSpyware utility, it will automatically disable Windows Defender to prevent conflicts.
When you say your files are locked, what do you mean exactly? Do you mean you are unable to open them in the application?
Try the following:
2438651 How to troubleshoot problems that may occur when you install, uninstall, or upgrade a program on a Windows-based computer
http://support.microsoft.com/kb/2438651
-----------------
Then
Unregister Windows Installer, and then reregister Windows Installer.
To do this, follow these steps:
1.
On the "Start" menu, click "Run:.
2.
In the "Open" box, type "msiexec /unreg", and then press ENTER.
3.
On the "Start" menu, click "Run".
4.
In the "Open" box, type "msiexec /regserver", and then press ENTER.
If this does not help the I would suggest to install the Windows Installer Cleanup utility and run that to remove the leftover Java installer files that may be causing issues with your current installation.
For further information, visit the below mentioned link:
http://support.microsoft.com/kb/290301
--------------------
You can also try the following:
Click Start Orb, in the Start Search box type: Regedit.
Scroll to: HKEY_lOCAL_MACHINE/SYSTEM/CurrentControlSet/services/msiserver
Verify that the SYSTEM account has Full control.
If it does not, add the SYSTEM account with Full control.

Modifying REGISTRY settings incorrectly can cause serious problems that may prevent your computer from booting properly.
Microsoft cannot guarantee that any problems resulting from the configuring of REGISTRY settings can be solved.
Modifications of these
settings are at your own risk.

----------------------
Another thing to try:
Click Start
Type: CMD, from the results, right click CMD
Click 'Run as Administrator'
At the Command Prompt, type: sfc/scannow
This will check for any integrity violations
Restart your system

Don't Download Malware

Where are you getting the download?

There are malicious people who download valid copies of a popular download, modify the file with malicious software, and then upload the file with the same name. Make sure you are downloading from the developer's web page or a reputable company.

Cancel or deny any automatic download

Some sites may automatically try start a download or give the appearance that something needs to be installed or updated before the site or video can be seen. Never accept or install anything from any site unless you know what is downloading.

Avoid advertisements on download pages

To help make money and pay for the bandwidth costs of supplying free the software, the final download page may have ads. Watch out for anything that looks like advertisements on the download page. Many advertisers try to trick viewers into clicking an ad with phrases like "Download Now", "Start Download", or "Continue" and that ad may open a separate download.