Here are some useful Links
Use this page to ensure your Operating system is up to date. It is important to keep up to date with new releases. many improve security and optimise system performance.
If you are not sure what type or amount of memory is in your machine use this site to tell you without having to open up your PC.
There are a number of sites that offer this service. Here is one of them.
Whether you have a dynamic or static address you can find your rersults here and some more information besides.