XAMPP on Windows - Apache not starting

I have installed XAMPP on my windows 7 machine but can't get Apache to work.

On start I get the following errors:

13:09:21  [apache]  Apache Service Detected With Wrong Path
13:09:21  [apache]  Uninstall the service manually first
13:09:21  [apache]  Possible problem detected! 
13:09:21  [apache]  Port 80 in use by "system"!
13:09:21  [tomcat]  Tomcat Service Detected With Wrong Path
13:09:21  [tomcat]  Uninstall the service manually first

After opening the XAMPP panel and installing Apache service: I have tried start it, it always get stuck "Starting apache service..."

Any advice on how I could resolve this ?

Thanks Jamil