On my 98SE box, the help works for Nero 220.127.116.11b installed by running nero55107b.exe and n551007eng.exe.
Thus your Nero installation seems to be broken for some reason.
The first possibility is that your installation files are corrupt. You may download nero55107b.exe and n551007eng.exe from ftp://ftp.nero.com
(unfortunately these sites change every day, so look around).
Normally there is no need for removing the previous version before installing another one. However, if this doesn't work, a cleaner installation may be obtained as follows. If you don't have the serial number (e.g., after an upgrade from an OEM version), run Start | Run| regedit and copy the serial number listed in
HKEY_CURRENT_USER\Software\ahead\Nero - Burning ROM\Info\Serialx
Then use Control Panel| Add/Remove Programs for uninstalling Nero, and delete the directory C:\Program Files\Ahead (to get rid of possible remnants of help files, etc). Finally, install Nero and the Language pack. (Before installation, it may be wise to clean your TEMP and TMP directories, and to stop all other programs, including your antivirus checker.)
The second possibility is that you installed a Language pack for another version of Nero (e.g., for the latest 18.104.22.168a). Then try to download and install n551007eng.exe as above.
Alternatively, you may download and install the latest version of Nero 22.214.171.124a and its Language pack from Ahead's site.
Finally, you could take a look at Nero Quick Start Guide and Manual
ftp://ftp6.nero.com/quickstartmanual/Ne ... rt_ENG.ZIP