$unInstallExepath= "c:\program files\netbeans 7.0\uninstall.exe";
my $path = dirname($unInstallExepath);     # $path contain  c:\program files\netbeans 7.0
my $exe = basename($unInstallExepath);   # $exe contain  uninstall.exe

chdir ('$path') or print "XXXXXXXXXXXXXXXXXXXXXXXXXXXX   $!";   
System ("start $exe");