i used "bazooka scanner" & followed directions to delete "twaintech.mxtarget"... but when it instructed to

"Start Windows Explorer and delete:
%WinDir%\mxtarget.dll
Note: %WinDir% is a variable (
?). By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\WINNT (Windows NT/2000)."

i found the file, however couldnt delete it... the message said "cannot delete mxtarget:access is denied..."

please please help... these popped up ads are very annoying... thank you