Most likely the dates will be shown with only two digits for the year. Microsoft recommends that you change the date display so that all four digits are shown for the year. If any of your software does have a date problem after January 1, displaying dates with four digits for the year may help you see the problem. After you change the date display, if you go back to Windows Explorer and look at the 'Modified' dates in your subdirectory, you should see the year displayed with four digits instead of two. Then install it and use it.
Virus checking software is updated often, as new viruses appear.
You must keep your virus checker updated as well. Virus software is not something you can do without, and it is not something you install and forget about. Some experts expect that a rash of new viruses will surface around January 1. If you're not already doing so, now is the time to start a routine of regularly backing up your computer's vital data, particularly your own files. While it is always important to back up your work, sometimes it may be even more important than usual.