Trouble installing pltcl language

["Hogan, James F. Jr." <JHogan@xxxxxxxxx>]

Can not install by

 

Create language pltcl;

 

Or

 

Createlang.exe pltcl --dbname=mydb –username=me

 

Keep getting

 

ERROR:  could not load library "C:/Program Files/PostgreSQL/8.1/lib/pltcl.dll": The specified module could not be found.

 

HELP