dude.. that's quite a messy english..:D
i think you should try like what i do..
have you edit this:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
<section name="TDUeditor.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
</sectionGroup>
</configSections>
<connectionStrings>
<add name="TDUeditor.Properties.Settings.carDataConnectionString"
connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\carData.mdb;Persist Security Info=True"
providerName="System.Data.OleDb" />
</connectionStrings>
<userSettings>
<TDUeditor.Properties.Settings>
<setting name="locality" serializeAs="String">
<value>GE</value>
</setting>
<setting name="tdupath" serializeAs="String">
<value>C:\Program Files\Atari\Test Drive Unlimited</value>
</setting>
</TDUeditor.Properties.Settings>
</userSettings>
</configuration>
and try after you change anything immediately click both the "save car" & "safe all changes" button
good luck then..