A couple of minor issues.
(a)Email label ends in a colon, the other labels don't.
(b) The Label For value is incorrect - should be register email.
<tr class="hikashop_registration_email_line">
<td class="key">
<label for="email" id="emailmsg">E-mail:</label>
</td>
<td>
<input type="text" maxlength="100" class="inputbox required validate-email" value="" name="data[register]