The link is good for me, also. There may be a DNS problem at your end.
Are you using a Hosts file in your Windows directory? If so, Adaptec may be listed in the file with an old IP address that has been discontinued.
If you are using a Hosts file, try either removing the Adaptec entry with a text editor or temporarily renaming the file. Close IE and reopen it to try the link again. Without the Hosts file the URL will have to be sent to a DNS server for the correct IP address.
If this isn't Hosts file related, there could be a problem with your DNS server.