Drupal Setup using WAMPSERVER (Port 80 conflict)

Hi Experts, I'm not pretty sure if it is relevant to post my question here but maybe some of you experience this and might be able to resolve my issue. I've zero knowledge in Drupal and am interested learning and intended to create websites using Drupal. I've installed WAMPSERVER on my laptop which conflicts on port 80 of my existing CRM & ERP Systems.

It pops up an error "HTTP Error 500.0 - Internal Server Error. Calling LoadLibraryEx on ISAPI filter "C:\Program Files (x86)\Common Files\Sage\Sage Accpac\Tomcat6\Jakarta\isapi_redirect.dll" failed" detailed error on IIS 7.5 when trying to launch my localhost on my default browser. I know my CRM & ERP uses port 80, my question is, would it be possible to change the default WAMPSERVER port number to any number so that it will not conflict with other system? or is there any other way to resolve it?

Any advise from you guys would be very much appreciated.

Thanks in advance!