This site is not one I've examined closely, but it displays the "Windows Partner" seal that usually indicates a legitimate place. It offers a couple of links to check for WkDetect errors, if you're concerned that your machine has been messed with.
The purpose of WkDetect is to check with Microsoft for updates to Works. If there is an update available, and WkDetect tells you about it, you probably need to let it install.
And for Joe - I wouldn't even think of turning off Windows Automatic updates. Leave it off for a week or two and it can take hours and hours of downloads to catch up .... and if you get more than a few weeks behind, you may have to re-authenticate your programs to get back in.
In fact, I'd recommend that in addition to accepting all automatic updates you should make regular "manual visits" to the update site and use the "Custom Install" to see what optional patches are available. Only security critical updates download automatically, and there are likely to be optional ones that will help keep things working more efficiently.