The recent update to BlackBerry Desktop Software (version 6.0) is hazardous and will mess up your install causing you to have to manually scrape it from your computer and revert back to the version you have on disk (most likely, 4 or 5). Be warned, you’ll get errors when launching the application that will prevent it from starting.
If you have earlier versions of the software and are prompted to update…my advice is to NOT update it. Unless you’re a fan of fail…then by all means give it a go.