There is a Trojan/virus (either the Win32/Pacex virus or the Win32/PSW.Agent.NDP trojan) that uses the two files ntde1ect.com and autorun.inf. Here is how you can get rid of them :

* Open Task Manager and in Processes tab end explorer.exe and wscript.exe process
* Open up File –> New Task (Run) in the Task manager
* Type cmd and hit Enter
* Type
* del /a:h /f c:\autorun.*
* Go to your Windows\System32 directory by typing cd c:\windows\system32
* Type dir /a:h /f avp*.*
* If you see any files names avpo.dll or avpo.exe or avpo.exe, use the
* Del /a:h /f avpo.exe
* Open up File –> New Task (Run) in the Task manager, Type regedit
* Navigate to HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
* If there are any entries for avpo.exe, delete them.
* Do a complete search of your registry for ntdelect.com and delete any entries you find.
* To Restore Folder Options Settings, Navigate to
* HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL


Look at the “CheckedValue” key. This should be a DWORD key. If it isn’t, delete the key. Create a new key called “CheckedValue” as a DWORD (hexadecimal) with a value of 1. The “Show hidden files & folders” check box should now work normally.


OR :
try smart antivirus here

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