If it is a renewal, then the organization should have your credit card number from the previous year and can easily recite it back to you. Or, call the business office and complete the transaction later. In this case you initiate the call and can be sure you are dealing with the proper organization. Finally, you can complete the transaction by mail. These sessions will be encrypted for all work done at Stanford.
New viruses seem to pop up every few days.
An old version of your anti-virus program may not detect a new virus. The most common viruses at Stanford currently are the Microsoft Word Macro viruses. There are over 85 different flavors within this family. These viruses infect both Macs and PCs. Most versions are non-destructive, but there are some strains that will destroy data and are therefore dangerous.