Hard Disk overload and system hanging

mrbobby

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10:24 PM
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First and foremost, hello to everyone.

Usually, I can solve my own problems involving computers and windows, but this time I'm kind of desperate. I need help figuring out what's wrong with my new laptop.

I bought an acer 4830TG in august 2011. Here's the description:
AS4830TG-2434G75MN | Product Model
(I'm sorry for the French, I couldn't find the exact same model on the US site)

Everything worked fine with it. It was a very good machine... So when it was stolen from me I bought the exact same model and things went sour:

I burned the recovery discs and subsequently installed a fresh Windows 7 Ultimate x64.
Then I carefully installed all the necessary drivers etc... Exactly as i did with the first one.

The problem is that every time i start an application that read/writes to the hard drives intensively, everything slows down, hangs or crash.

For example:

When making a copy from my desktop computer over the network (directly through a crossed cat5e cable), the throughput initially reaches 50-70 Mb/s and rapidly comes down to 10-15 Mb/s. At this point, I can't to do anything with my laptop while copying in background... My browser is unresponsive for several seconds at a time, then is responsive again, then is unresponsive etc... If I try to play a video with VLC it seems it can't buffer more than 10 seconds of video before buffering again for several seconds (I solved that particular issue by moving the video file to a ramdisk prior to playback)... Simply opening My documents or the control panel takes more than a minute.

On rare occasions, the system crash and I get a BSOD. Note however that if I let the copy finish without doing anything else, everything works fine except for the low throughput. I know I can expect more than 15 Mb/s because with the first 4830TG it was generally over 50Mb/s.

This kind of behavior also occurs when I'm burning a disc, when µtorrent is checking a file, when I'm copying files from one partition to another etc...


I can't figure out where lies the problem:
- all drivers are listed as "up to date" by windows update and there is no unknown device listed.
- RAM usage appears normal, the system is not overloaded with unnecessary applications. (At boot it uses about 1.2Go with AVG 2012 free, daemon tools, Malwarebyte's and dropbox).

Does anybody has any insight? Any help would be greatly appreciated.
 

My Computer

OS
Windows 7 Ultimate x64
Do you get the same behavior if:

Anti-virus is disabled?

All non-Microsoft services are disabled?

Startup tab in msconfig has nothing checked?

When booted into safe mode?

When simply copying a large file from folder A to folder B?

I"m just stabbing in the dark here.

What is revealed about running processes when you look at Task Manager and/or Resource Monitor?
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Ignatz Special; 4 speed manual gearbox; factory air conditioning; one of one
OS
Windows 7 Home Premium SP1, 64-bit
CPU
Intel Skylake i5-6600K, not overclocked
Motherboard
AsRock Z170M Extreme 4, micro ATX
Memory
8 GB HyperX DDR4-2666 (2 x 4 GB)
Graphics Card(s)
none; graphics are integrated on CPU
Sound Card
onboard: Realtek ALC1150; external: USB Behringer UF0-202
Monitor(s) Displays
Dell S2340M 23 inch IPS
Screen Resolution
1600 x 900
Hard Drives
System: Crucial MX100 series SSD, 128 GB;
Data: Samsung Spinpoint 103SJ, 1 TB;
Backup: WD Caviar Green WD30EZRX-00D8PB0, 3 TB
PSU
Rosewill SilentNight 500 watt fanless, semi-modular
Case
Antec Solo II
Cooling
Noctua NH-U12S; Noctua F12 intake, Noctua S12A exhaust
Keyboard
Microsoft 200 6JH-00001 USB
Mouse
Dell or Microsoft optical wired; USB
Antivirus
Microsoft Security Essentials and Malwarebytes Premium
Browser
Pale Moon
Other Info
All fans PWM; speeds at idle: CPU circa 500 rpm; intake circa 600 rpm; exhaust circa 600 rpm; CPU temps 27 idle and 47 C load in a warm room (27 C/81 F) when running Intel Extreme Tuning Utility stress test.
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