how to remove invisible program Spy Cobra

If you want a step by step guide on a clean install read this: Clean Install Windows 7 - Windows 7 Forums

Stephen

Be aware that certain rootkit viruses can even survive reformatting a hard drive. In these cases the only 100% safe option is to replace the hard drive and reinstall Windows

The solution is use Process Explorer from Microsoft and look for Winlogon. Remove any entry after "," (comma).
This will prevent from auto starting...

Normally they are hidden from the user so go to c:\ click on View > Options > View > Show Hidden Files, Folders and drives and press OK

To remove the files use an anti virus or navigate to c:\program files\ and look for suspicious folder.

Brink said:

Hello Redcherry,

It may be best to just do a clean reinstall of Windows 7 since there's no telling what else he may have done or installed on your PC. Afterwards, change all your passwords. I would also recommend to not let him back on your PC, and you might consider kicking him to the curb since that's a violation of your trust in him.

"Kicking" is the correct idea..."Curb" is the wrong place.

People and what they do never ceases to amaze me.