Hi
As it is a desktop and quite old, perhaps the date and time are incorrect due to a flat cmos battery. If it is wrong you can reset it in control panel , date and time.
If you want to run ipconfig you need to start an administrator cmd prompt.
Click the Start button. In the Search programs and files box that appears just above it, type cmd . In the results, above the search window, right-click cmd and select Run as administrator. If a User Account Control prompt pops up, click Yes.
Running chrome on XP, it keeps saying it is not supported. So as Geek suggested Sea Monkey or as i think Opera might be good options instead.