|It doesn't seem like the date would revert back with a new battery even with a power outage. Well at least it's working now. Just keep an eye on its system clock.|
The highest IE version that works with XP is IE 8. If you don't have that version you should upgrade to it, although many sites will tell you it's outdated and won't load properly. And it's not supported by MS anymore so there's no updates.
If you already have IE 8 try clicking on 'tools' from its dropdown menu, then 'internet options', then 'advanced', then down at the bottom click 'reset' to 'reset internet explorer settings'. Maybe that will fix it.
If you need to update to IE 8 the files may still be on MS's site somewhere. If not you'll need to google these 3 files to find a download:
The first is the IE 8 installation file. The second is a cumulative update file for IE 8 and the third is a security update they deemed so critical they reopened IE 8 support for XP just to post it.