I've already opened a ticket on this but thought I might as well mentioned the problem here.

During my weekly general PC updates/maintenance regime which includes SpyBot definitions updates when I tried downloading them this week there are two sets of updates. Both are reporting "!!! bad checksum!" from ALL seven definition download sources and, of course, won't install.

This has happened before, a long time ago, and it was some form of download data corruption with the latest definitions updates package or similar problem Spybots' end, rather than anything to do with my PCs. It was fixed in the following updates.

Hope that is this case this time too.