The following instructions have been created to help you to get rid of "Locksky.NAG" manually.
Use this guide at your own risk; software should usually be better suited to remove malware, since it is able to look deeper.

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Threat Details:

Categories:
  • malware

Description:
There is no legit file, that also installs itself in Winlogon to get started at logon time.
Supposed Functionality:
supposed to be a Microsoft file for installing SQL catalogs
Removal Instructions:

Files:

Important: There are more files that cannot be safely described in simple words. Please use Spybot-S&D to remove them.

Registry:

You can use regedit.exe (included in Windows) to locate and delete these registry entries.
  • Delete the registry key "instcat" at "HKEY_LOCAL_MACHINESOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\".
If Locksky.NAG uses rootkit technologies, use our RegAlyzer, RootAlyzer or our Total Commander anti-rootkit plugins.

Final Words:

If neither Spybot-S&D nor self help did resolve the issue or you would prefer one on one help,
  1. Please read these instructions before requesting assistance,
  2. Then start your own thread in the Malware Removal Forum where a volunteer analyst will advise you as soon as available.