Installer CRC invalid

Hi,

Whenever i try to run an installer made by the NSIS, no matter what it is or where i downloaded it from, i get the message "Installer CRC invalid." I assume this is a problem with my system, but I have no idea what to do. Can anyone help me?

Thanks

have a looky at http://64.12.38.241/showthread.php?threadid=58774