Opencl.dll is missing

I did a complete removal of drivers using amd catalyst install manager and driver fusion. I then re-installed catalyst 13-1. Using hd6870.

c:\oclHashcat-plus-0.14>oclHashcat-plus32.exe -m 2500 -d 1 -o key 25342_1370543398.hccap g:\noname2
System error: The program can't start because OpenCL.dll is missing from your computer. Try reinstalling the program to fix this problem.

I'm new to AMD so could someone give me a plan?