For the most part, this will not play nice with your recording programs but let’s be realistic about this. The average Joe uses their music computer for all of their business as well. It’s not the best way to handle it, but not everyone has the space (or cash) to run two separate computers. If you don’t have a separate machine for Internet, use the least intrusive antivirus app that you can.
We recommend AVG or Microsoft Security Center. There is little CPU usage with these, still they seem to be pretty effective. If you need more security, you should think about using Internet on a different computer, or just change your browsing habits. A light antivirus app and a good browser like Firefox with the Adblock Plus extension can do miracles.
Windows 7 is much more efficient with its graphics on modern graphics cards. There are exceptions to this, but for the most part you should be fine.
If you are an enthusiast and would like to further optimize your PC we recommend Black Viper optimizations in addition to this guide. You can find it HERE.