Disable System Restore. Scan your computer with the free version of Malwarebytes' Anti-Malware.
http://malwarebytes.org/
If you don't have an Anti-Virus program, download Avast and scan.
http://www.avast.com/
If both scans don't detect anything, do this..
Ctrl-Alt-Del > Processes - End the following processes in order:
dxdlg.exe
wscript.exe
Start > Run > regedit - Open the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\ Microsoft\Windows NT\CurrentVersion\Winlogon
In the right hand pane, select Userinit and delete everything except C:\windows\system32\ userinit.exe
Make sure the processes wscript.exe and dxdlg.exe are not running.
Delete the following files
C:\Windows\System32\dxdlg.exe
C:\Windows\System32\boot.vbs
In your Windows drive, search for boot.vbs and delete all of them.
In your Windows drive, search for kinza.exe and delete all of them.
Enable System Restore.
Restart your computer.