If you want more, need to use 3rd party partition software
http://www.partitionwizard.com/free-partition-manager.html

normal for SB..

laggy could be the HDD or the bloatware. Can you run CrystalDiskInfo to check if the HDD still good ?
Noise, nothing much either get use to it or use earphone.
TurboBoost is the self-overclocking feature on the processor, e.g for i5 2410M, it will boost from 2.3GHz to 2.9GHz. But this usually introduce more temperature. You can disable it by:
1. Open Power Option
2. Change Plan Settings (the current plans you are using)
3. Change Advanced Power Settings
4. Go to Processor Power Management
5. Go to Maximum Processor State
6. Set it to 99%, both if you want the TurboBoost always disabled.

http://crystalmark.info/software/CrystalDi...fo/index-e.html

F series if you want the better screen..
SE if want lower weight..

Couldn't find much confirmation that SE is using IPS, at least it has decent viewing angle..

http://forum.notebookreview.com/7995251-post288.html
http://forum.notebookreview.com/7996039-post304.html

Can you open that unknown device properties, go to details, hardware ids, and post the content here ?

hmm, never seen hardware ids with USB/UNKNOWN.

Can you right click that unknown device and uninstall it.
Then "Scan for hardware changes", then check again the hardware ids.

Just to make sure, on the device manager, is there anything under the "Imaging devices" ?

Looks like motherboard problem ?

Check the battery wear level ? using Battery Care..

Did you run BatteryCare and check the detailed information?
http://batterycare.net/

Open the Intel HD control panel, go to power - battery, uncheck the Intel Display Power Saving Technology.

What about GPU-Z? Can detect the nVidia ?