ok, I had some problem to understand what you want, but I guess I got it ...
note - you will maybe need some CSS editing too, but to this later...
1) line-up of the login block for anonymous user
Just delete the Break behind the "Lembrar" ... you might need to add there some non-breakable space ( ) instead to make it look nice ...
<input type="checkbox" name="rememberme" value="On" class ="formButton" />Lembrar[color=FF0000][b]<br />[/b][/color]
2) line-up of the user menu of logged-in user
There are probably different ways how to do that. Besides some CSS tweaking (removing the Display:block; directive from the menu and adding some padding arond to get the similar effect, but... ) I think, probably the easiest way with just HTML would be to put this menu in one row of table cells.
Now:
<{if ($xoops_isuser)}>
<td id="usermenu">
<a class="menuTop" href="<{$xoops_url}>/user.php">Minha Contaa>
<a href="<{$xoops_url}>/edituser.php">Editar Contaa>
<a href="<{$xoops_url}>/notifications.php">Notifica??esa>
<a href="<{$xoops_url}>/user.php?op=logout">Saira>
<{if $block.new_messages > 0}>
<a class="highlight" href="<{$xoops_url}>/viewpmsg.php"><{$block.lang_inbox}> (<span style="color:#ff0000; font-weight: bold;"><{$block.new_messages}>span>)a>
<{else}>
<a href="<{$xoops_url}>/viewpmsg.php">Caixa de entradaa>
<{/if}>
<{if $xoops_isadmin}>
<a href="<{$xoops_url}>/admin.php">Administra??oa>
<{/if}>
td>
<{else}>
And after that table-cell inprisonment:
<{if ($xoops_isuser)}>
<td id="usermenu">
<table><tr>
<td><a class="menuTop" href="<{$xoops_url}>/user.php">Minha Contaa>td>
<td><a href="<{$xoops_url}>/edituser.php">Editar Contaa>td>
<td><a href="<{$xoops_url}>/notifications.php">Notifica??esa>td>
<td><a href="<{$xoops_url}>/user.php?op=logout">Saira>td>
<{if $block.new_messages > 0}>
<td><a class="highlight" href="<{$xoops_url}>/viewpmsg.php"><{$block.lang_inbox}> (<span style="color:#ff0000; font-weight: bold;"><{$block.new_messages}>span>)a>td>
<{else}>
<td><a href="<{$xoops_url}>/viewpmsg.php">Caixa de entradaa>td>
<{/if}>
<{if $xoops_isadmin}>
<td><a href="<{$xoops_url}>/admin.php">Administra??oa>
<{/if}>td>
tr>table>
td>
<{else}>
There might be a little problem with the style of the new table which is around the menu ... but it depends on the CSS you use, if there is any border, padding, margin for any table, tr and td tags...
Test it ... and we will see...
Happy xoopsing