What to do if the system cannot open an. exe executable file

Some friends open the computer, click on the properties of my Computer pop up a dialog box said "Can't find C:windowssystem32rundll32.exe", want to open some already installed software program but pop up a dialog that you choose to open the way, later found that antivirus software also disappeared, Even more surprising is the inability to install files,. exe files cannot be opened! What's going on here? How do i troubleshoot an. exe executable file that cannot be opened?

Workaround: The exe open method is modified by Trojans or viruses, unable to open any executable file solution.

Method One: First change the name of Regedit.exe to Regedit.com or REGEDIT.SCR.

Run regedit.com, locate the Hkey_classes_rootexefileshellopencommand key value, change the default value to%1%* reboot, and then change regedit.com back to Regedit.exe.

Method Two: Save the following content as Exefile.reg, double-click the Import registry, or run Regedit exefile.reg in pure DOS, import the registry. (Note: Leave a blank line behind the REGEDIT4)

Regedit4

[hkey_classes_rootexefileshellopencommand]@=%1%*

Method Three: (Apply to WIN2000/XP only):

Step 1, rename the Cmd.exe to cmd.com or CMD.SCR.

Step 2, Run cmd.com

Step 3, run the following two commands: Ftype exefile=%1%*assoc. exe=exefile

Step 4, change the cmd.com back to Cmd.exe

Method Four: The new association EXE file. Open any window (not IE window), tools--Folder Options--File type--new--fill in "EXE" in "File name extension"--click Advanced, select "Application" in the Pull-down menu--OK.

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