Thanks for the url
The temps look ok so are less likely to be responsible for the poor performance, this leaves McAfee hogging resources and an untidy HDD, is McAfee a paid for product.
You have the following scheduled updates which are totally unnecessary, they will slow down your computer and so should be disabled/deleted;
03/05/2015 21:09;: GoogleUpdateTaskMachineUA
03/05/2015 21:39;: Adobe Flash Player Updater
04/05/2015 07:09;: GoogleUpdateTaskMachineCore
08/05/2015 20:00;: RealDownloaderDownloaderScheduledTaskS-1-5-21-982955010-2966400737-2978171777-1000
09/05/2015 10:44;: RealUpgradeScheduledTaskS-1-5-21-982955010-2966400737-2978171777-1000
10/05/2015 07:56;: RealDownloaderRealUpgradeScheduledTaskS-1-5-21-982955010-2966400737-2978171777-1000
10/05/2015 18:11;: RealPlayerRealUpgradeScheduledTaskS-1-5-21-982955010-2966400737-2978171777-1000
15/05/2015 01:00;: McDefragTask
01/06/2015 01:00;: McQcTask
Adobe Acrobat Update Task
Post back with an update once the above has been done and we can move on.
NB: Consider upgrading your Ram in the future as it is still the best value for money performance improvement that you can make.