Technology for web portal

Hi I am a complete novice at programming with some knowledge of core Java and C++. I need to make a web portal which will:

run some tools on client's pc using data from their pc, store the output in a database and do some processing with the data.

Please suggest some possible technologies that I can use for this.From what my situation seems to me, I will anyhow have to learn a lot of new technologies, so I am trying to find which will be the most easy to learn and suitable for this problem.

All I know is that we can do this using JSP and C#. How easy/hard will it be to use these technologies? What other technologies can I explore for this?