If you have 29% at all times, then there's definitely something taking up RAM. When it said 29%, did you have Minecraft open/record, etc.? Or was everything like Skype/Minecraft closed? If open - that's normal, if closed - something's wrong.
With certainly with all the regular programs opened and MineCraft opened it couldn't take 29 percent of the CPU.
I only had Minecraft and Skype open.
Alright, I recommend getting PC Decrapifyier, delete all the bloatware, Norton, WinZip, then use Ninite to install the needed things 7ZIP, etc. Once done get CCleaner and under tools go to start up, turn off everything that you know isn't useful or needed.
Then go to Task Manager go to processes and look for something that is taking up a lot of CPU usage that isn't Windows, etc.
Delete your anti virus and get AVAST, even if it's paid for, it's probably Norton or MCFEE which are intrusive bloatware that are garbage anti viruses.
If Torrenting, always stop seeding.
I really don't know, it should be visual from Task Manager, always.
Also, never buy Alienware, they're kinda overpriced.