title: Does "Oracle Express 11gR2" installation can mess a Win7 system that run an oracle Application?
body: <p>As in title, I want to install "Oracle Express 11gR2" on a Win7 machine that run Opera PMS Sotware (pms for Hotel Management) via Internet explorer.</p>
  
  <p>I want to write a Python script that will use cx_oracle module.
  I tryed first with "instant client" : I put its PATH in windows environnement and follows tutoriel, but i still have an import error with cx_oracle module... or an error that tell me there is no oracle application on the computer...</p>
  
  <p>It seems i have to install the Oracle express instead of using the "instant client".
  But first, i must be sure there will be no dependancies mixing up and  messing the system...
  Can i do that blindly ? I can give further info if needed</p>
  
  <p>Thanks</p>