Nothing showing that would explain a drop in performance but you do have a couple of security concerns, no AV running and you download torrents, are you aware of the risk of malware infection when downloading torrents and especially with no AV protection running.
Company Name Microsoft
Display Name Microsoft Security Essentials
Product Version 126.96.36.199
In view of both of the above I suggest you refer to the GTG malware redirection information below;
I suspect that you have some malware on your computer causing issues that we are not able to solve through means we can use here in the Tech Forums. I suggest you read the 'Start Here' topic found here. With these self-help tools you have a high chance of fixing the problems on your own. If you are still having problems after following Step 3 of the guide, continue with Step 4 and 5 and post in the Malware Forum. If you are unable to run any programs, Please create a topic stating what you have tried so far and that you are unable to run any programs. Also, Please do NOT post the logs in this thread.
If you are still having issues after the malware expert gives you a clean bill of health, Please return to THIS thread and we will pursue other options to help you solve your current problem(s).