First of all let me explain..
I already install this module but unistall it by mistake...
Now am trying to install it again but get this error message "Installing Php AddsNew
Table 'xoops_phpads_adstats' already exists
Unable to install phpads. Error(s):"

Did you actually do an uninstall in the modules admin page or just delete it from the modules directory?

If the latter just reupload the module and it should work without reinstalling.

To see the proper way to handle modules (if you are not totally sure) see the Module Deployment Flash tutorial series on my site.

Yes i install and unistall the module correctly....now am trying to install it again and get that error above..
any ideas?

If you have access to phpmyadmin, locate the tables for the module and drop them from the database manually.

ok, i installed phpmyadmin and drop the table, now am able to install the module but when i click on setting it send me to the install screen and gives me all these errors:

Notice: Undefined variable: strDatabaseSettings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 43

Notice: Undefined variable: strDatabaseServer in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 44

Notice: Undefined variable: strDatabaseOptimalisations in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 45

Notice: Undefined variable: strInvocationAndDelivery in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 46

Notice: Undefined variable: strAllowedInvocationTypes in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 47

Notice: Undefined variable: strKeywordRetrieval in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 48

Notice: Undefined variable: strZonesSettings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 49

Notice: Undefined variable: strP3PSettings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 50

Notice: Undefined variable: strBannerSettings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 51

Notice: Undefined variable: strDefaultBanners in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 52

Notice: Undefined variable: strAllowedBannerTypes in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 53

Notice: Undefined variable: strTypeWebSettings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 54

Notice: Undefined variable: strTypeHtmlSettings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 55

Notice: Undefined variable: strStatisticsSettings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 56

Notice: Undefined variable: strStatisticsFormat in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 57

Notice: Undefined variable: strEmailWarnings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 58

Notice: Undefined variable: strRemoteHosts in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 59

Notice: Undefined variable: strAutoCleanTables in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 60

Notice: Undefined variable: strAdministratorSettings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 62

Notice: Undefined variable: strLoginCredentials in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 63

Notice: Undefined variable: strGuiSettings in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 66

Notice: Undefined variable: strClientInterface in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 68

Notice: Undefined variable: strInterfaceDefaults in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 69

Notice: Undefined variable: strInventory in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 70

Notice: Undefined variable: strStatisticsDefaults in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 71

Notice: Undefined variable: strWeightDefaults in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php on line 72

Warning: Cannot modify header information - headers already sent by (output started at \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-settings.inc.php:43) in \\premfs19\sites\premium19\decache\webroot\decache\modules\phpads\admin\lib-gui.inc.php on line 280