...
The Basic Install of S4S assumes you have the Web Forms for Marketer package installed. If you are not using WFFM, you should remove WFFM from the installation package before installing S4S. To do this, open the core zip file and note the Web Form for Marketers item in the following node:
| Section |
|---|
| Sitecore For Salesforce-Core-1.7.13344.1.zip\items\master\sitecore\system\Modules |
You cannot delete directly delete this item without a security message so extract the entire zip to a new unzipped Sitecore for Salesforce - Core-x.x folder then drill down and delete the WFFM item. Next delete package.zip out of the original zip file and drag the entire modified package.zip across to the original. Install the modified zip as normal.