Support64 should be located in your Pelles C BIN folder...
First question ... Do you have a 64 bit OS in your laptop?
Next question ... What version of Pelles C are you trying to install?
You may have a corrupted copy ... where'd you get it?
The latest version can be obtained from ....
HERE When you get the new copy... Before you install it, completely uninstall the copy you have.
Go into REGEDIT (Win+R, regedit, ok) and remove the branch named
KEY_CURRENT_USER\Software\Pelle Orinius
Then install version 7r (32 or 64 bit depending on your OS) on defaults...