This year I'm not traveling far, but normally I go home and am immediately forced to deal with a computer that hasn't been updated since the last time I was there.
If its not too late to pretend you don't know anything about computers, read below.
Assuming its a windows environment:
Install the latest version of Firefox/Chrome*, change the icon to use the IE icon if the computer's owner "doesn't need a new browser", download/run ccleaner, download/run defraggler, download/run microsoft security essentials and malwarebytes.
Enjoy turkey day.
Or just don't do anything -> http://lifehacker.com/5861649/how-can-i-get-out-of-doing-all-my-familys-tech-repair
Source -> http://lifehacker.com/5862161/how-to-fix-your-familys-computer-this-holiday-so-the-rest-of-the-year-is-easy
Links to those apps -> https://ninite.com/dotnet-essentials-firefox-flash-flashie-java-malwarebytes-teamviewer/ninite.exe - http://www.filehippo.com/download_ccleaner/download/1f5289130a59817c2280aa108b3f6f72/ - http://www.filehippo.com/download_defraggler/download/650315059cde24e032d764952154cb5a/