Assuming that Delphi and the other VCLs are is installed in the same folder at the new PC, then the migration is fairly easy if you are comfortable working with regedit.
The information is stored in the Registry under a key called
HKEY_CURRENT_USER\Software\Borland\Delphi\5.0 or something like that.
You'll find all the registration information under that key, including a
list of installed packages.
Just export the keys to a registry
file, copy it to the new computer and install it by double-clicking on it