Failed to open application error "Application not found".

A week ago, my computer has been assaulted by an anti-spyware scam (it happened), and I got a code off of the Internet to stop it. Because, as those who are familiar with it, you can not go on the Internet unless buy you it or have an activation code. But, after having done that, a few days later, my computer started acting strangely. For example, by clicking on the links to Web sites, the computer could take me to a very strange place, and I have to type in the site, try again or click on cache.
Another thing, now I can not access my Microsoft Works. I click the icon and the House appears, but he says that "Microsoft was not able to open the selected project. The file may be damaged. "I can access now not all of my files on Microsoft Works.
Another thing, which is really weird, a day trying to get on the Internet my computer made me choose the program by which I wanted to go on the Internet (what?). So, I had search for Firefox. And, it does not only for the Internet, he is also for Microsoft Works and other programs on my computer.
And she always does when I try to go on the Internet.
Another thing, I am not able to download or install anything more. I really think that my computer has a virus. When I try to download/install something, there is a message that appears that says something on the lines of "Application not found".
I tried the system restore, but it doesn't seem to work.
Help, please.

-Thank you.

Hello

Method 1: Run the fixit available in the links below and check if that makes a difference-Worth to try
Difficulty of broken desktop shortcuts and common system maintenance tasks

Note: FixIt would attempt to recover bad sectors on the hard disk, in the course of this process there are chances of DATA loss from that particular area.

Method 2: run the fixit available in the article below

When you run an .exe on a Windows Vista-based or Windows 7 computer file, the file may start another program

http://support.Microsoft.com/kb/950505

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems can occur if you modify the registry incorrectly. Therefore, make sure that you proceed with caution. For added protection, back up the registry before you edit it. Then you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click on the number below to view the article in the Microsoft Knowledge Base.
How to back up and restore the registry in Windows

Method 3: If a Protection of resources Windows (WRP) file is missing or is damaged, Windows may not behave as expected. Auditor of file system (CFS) scan to fix all of the corrupted system files. To do this, follow the steps mentioned in the link below:

How to use the System File Checker tool to fix the system files missing or corrupted on Windows Vista or Windows 7

http://support.Microsoft.com/kb/929833

Method 4: Run Microsoft Security scanner (MSS) to any threat and try to correct

http://www.Microsoft.com/security/scanner/en-us/default.aspx

Note: Infected files can be deleted from your computer; There is a chance of data loss.

You can learn about browser hijacking

Difficulty of your web browser hijacked

http://www.Microsoft.com/security/PC-security/browser-hijacking.aspx

Tags: Windows

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