Click here to go to the Sony site for the DRM claim.Basically, Sony installed a rootkit onto the computer that hides itself from the operating system to protect the CDs from becoming copied. Wikipedia has a great explanation of what a rootkit is.
Eraser is a great, free program to securely erase files, folders, and entire hard drives to prevent anyone from recovering the data.
For Microsoft Outlook, I use SpamBayes, an open-source spam filter for Outlook. It is easy to install and works pretty well, with just a few false positives. You can use it for Outlook Express, but it is real geeky to install.I've used Cloudmarks Desktop, which is a monthly or yearly subscription with good results as well. I am seriously considering using a product that only allows white-list senders, or those that I only accept mail from, like ChoiceMail.