When you start a program you open ports to communicate. So that in itself could leave you open for an attack, not to mention you're using a really well known chat client with really well known exploits.

Sounds like you need to be introduced to my friend Mr.Google. Mr.Google has most, if not all, the answers. And you can even go talk to Mr.Google for free. http://www.google.com
I would use the advanced search function and there is even a tutorial for just that here at AO.