Norton, and other near-system-level software, is specific to the operating
system. That is, it automatically installed the correct *.DLL files for the
operating system that it senses. If you upgrade the OS, the Norton products
will not work and worse, if they did work, they could damge the file system.
So, you must uninstall all Norton products (MacAfee, too, if you have any).
You must also uninstall CD writing software, like Easy CD Creator or Nero.
You do not have to uninstall Office 97 or 2000; they seems to work OK under
XP, although you might need to install the latest service pack for Office.
You should have uninstalled Norton BEFORE upgrading to XP, since the
add/remove programs feature of XP will probably not uninstall it completely,
since it was installed under 98. Go to the Norton support site and search
for how to manually uninstall Norton. Thye might even have an uninstaller
tool. Ditto for Easy CD Creator, if you have it. I know they offer an
uninstaller tool.
Once you get rid of Norton, completely, reboot (good practice), then
re-install.
While it is a bit late to mention this, Microssoft offer a free Upgrade
Advisor that would have scanned your PC for both hardware and software
incompatibilities with XP, and suggested what to do to fix them.