Thanks for sharing your config..and since you are kaspersky user, you might want to try the 2015 (latest version) as MrExplorer mentioned above, it's lighter and stable than the previous one. Probably adding on demand scanners like mbam/hitman pro/npe would be good too. As for browser plugin..if you are using chrome then you might want to try u-block..it's lighter than ad block, you might want to try both though and find which one is better suite you.