Google play services (lib build path error)

I have 2 computers on which I develop my app. On one of the I had a problem with adding Google play services library.
Each time I have imported the Google play services into workspace (eclipse) and then built a path to it, nothing happened and then the path was receiving error (an X symbol next to the lib include).

The solution was to set both project (Google service and My project) on the same physical driver (for example C driver).  

More about the app environment

So here is the full environment list of the app:
Client side:
Android -

<uses-sdk

        android:minSdkVersion="14"

        android:targetSdkVersion="18" />

I am using Eclipse IDE with the ADT plugin for developing Android applications.

I hate the built in emulator of Eclipse, so I found Genymotion emulator (try it, very fast!!!). I will talk in my next posts about this emulator.

Server side:

Java- 7th version. I am using maven platform. And my IDE is Eclipse.

DB- MySQL.

localhost- Apache Tomcat 7.0

Hosting:

I am using Heroku for my server side stuff (DataBase and server).

For the client side I am using GIT on BitBucket for version control.