Just for starters,

• To see the errors, run the program from a command prompt:
  Start | Run | cmd
  From the command prompt:
  perl script.pl

• You should really put
  use strict;
  use warnings;
  at the top of your program. This will save you lots of grief, even though you'll have to start declaring your variables (using my).

• You still have the for wrong. I suggest you re-read the documentation.
  for ($i==$x; $i==$y; $i++)
  should be
  for (my $i=$x; $i==$y; $i++)
  (my added as a bonus)
  Or if you want to include $y,
  for (my $i=$x; $i<$y; $i++)

  But why not use the easier to read/understand/write
  for my $i ($x..$y-1)
  Or if you want to include $y,
  for my $i ($x..$y)

• Similarly,
  for ($m=3; $m=$n; $m+=2)
  should probably be
  for (my $m=3; $m<$n; $m+=2)

• By the way, you're assuming (i.e you don't validate) that the user supplies integers for $x and $y, and that the number he supplied for $x is smaller than or equal to $y.