Unable to Start a Program with an .exe File Extension..

This problem i face when i was in sydney..
the problem is that ..when i click any exe file they opened in a open as " window prompt..... this is due to some Virus problem... It seems that i have to format my comp and reload my Os again..

Think how i resolve the solution when cmd,taskmanager, regedit, gpedit.msc, msconfig, internet explorer, any exe file and other tool is not working at all...................

before that i search to the internet and find the cause and solution..

Symptom

When you try to launch an application (.exe files), the following error message appears and the program does not run.

Cause

This problem occurs if the .exe file association in the registry is corrupt. This behavior is generally caused by viruses; one of which is SirCam virus, which modifies the .exe file association in registry.

Resolution
Method 1: Fixing the association settings automatically

Download exefix_xp.com utility(http://www.winhelponline.com/exefix_xp.com) and save to Desktop. Double-click the file to run it. This utility fixes the exefile association in the registry automatically.

Additional tip: To run the utility silently (without any prompts), use the -silent parameter. Open a Command window (Command.com) and type:

C:\Utilities\exefix_xp.com -silent

Assuming that the exefix_xp.com is placed in the C:\Utilities directory.
Method 2: Fixing the association settings using Registry editor

Click Start, Run and type Command
Type the following commands one by one:

cd\windows
regedit

If Registry Editor opens successfully, then navigate to the following key:

HKEY_CLASSES_ROOT \ exefile \ shell \ open \ command

Double-click the (Default) value in the right pane
Delete the current value data, and then type:

"%1" %*
(ie., quote-percent-one-quote-space-percent-asterisk.)

Navigate to:

HKEY_CLASSES_ROOT\.exe

In the right-pane, set (default) to exefile
Exit the Registry Editor.

If you're unable to launch Regedit.exe even from Command Prompt, try this:

copy regedit.exe regedit.com
regedit.com


at last i was able to solve the problem and everything is working as before..
thanks god.........