"Zlob" is one very bad piece of spyware; do you have an
antiSPYWARE/antiTROJAN program on your computer ?
If yes, have you run their "Full Scans" ?
For something this potentially serious, I recommend you
use the FREE version of "SUPERantispyware" from http://www.superantispyware.com
IF this will NOT be removed, you should post a "HijackThis"
program "log" on a Support forum and you should
download HijackThis (© Merijn) from: http://www.thespykiller.co.uk/files/HJTsetup.exe
Note: This is a complete installer that installs HijackThis to your computer at C:\Program Files\HijackThis, making an entry in the start menu and also providing a desktop shortcut. If HijackThis is used from a temp folder, it is in danger of being accidentally deleted by clean up tools.
At the download prompt, choose "Save". After the download is complete, navigate to the C:\Program Files\HijackThis folder and double-click it to complete the installation.