First make a backup of your registry. If you do not know how, Click Here.

Then,
Start > Run > type "regedit"

Then go to each of these reg settings and see if you see the "buckstoolbar" or any of the three things you are looking for. If you see them, delete them. Be careful not to delete anything that you are unsure about, however, the backup that you did first can be used to restore settings if you make a mistake.
HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\RunOnce
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Run
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\RunOnce

Also, use Spybot Search and Destroy as well as Spyblaster to protect your machine from getting any spyware like this. Hit me up on AIM if you need any help.