Acer Aspire V3 571G very slow after fresh Win7 install, dust cleaning, paste replacement.

AndreiR

Hello,
I've been using a Acer Aspire V3 571G for almost two years. Since April I've been having huge performance drops from my laptop. The laptop has a fresh Win7 instalation, all drivers were formated prior to instaling it, the inside of the laptop is dust free and the thermal paste was changed a week ago. 
The HDD makes no repeating noise, CPU temperatures are a bit high reaching 40 degrees C on idle and 80 when gaming, editing, etc and the GPU reaches 40 when idle nad 75 when under stress.
My laptopt takes a lot to do even basics tasks as starting a PPOE connection, showing the sound slider(40s after clicking it), at somepoint it slowed my internet to a crawl(1.4MB/s out of 100MB/s) but it got solved by installing the 2012 driver. Using a browser, gaming, watching streamed videos is a nightmare.
Even 2009-2013 games seem to challenge it even if my laptop should play it like Solitaire..
I really don't know what to do to restore my laptop back to it's glory days and any advice is welcomed.

AndreiR

This was a temp test done after the paste replacement, now all termperature are lowered by 5-10 degrees C. Software used for reading temps are in ( ).
Idle Process Test
CPU(HW Monitor)
Cores(# 0->3) Temp: Min: 42 C Max: 59 C Curent: 41-46 C
Clocks(#0->3): Min: 1196MHz Max: 3196MHz Current: 1198, 3195, 2895(the core reaches only these 3 values at a time, independetly)

HDD: Min30 C Max: 32 C Current: 32 C

GPU(MSI Afterburner)
Temp: Min: 43 C Max: 44 C Current: 44(slowly rising to 46) C
Clock: 405 MHz
Memory Clock: 900MHz

Task Manager Readings:

CPU Usage: 0% on all 4 cores(97% Maximum Frequency)
Memory Usage: 1.71 GB (20% Used Memory)

*After readings were taken:

CPU Temp: Min 35 C, Max 73 C, Current: 57-64 C

Test #1
Viewing a 1080p 60FPS Browser Video
Browser: Google Chrome(Latest Edition as of 21st May 2015 )

CPU: Min 52 C, Max 62 C, Current: C0: 61 C, C1->3: 53->58 C
Clocks Unchanged

GPU:
Temp: ~46 C
Clock: 405 MHz
Memory Clock: 405 MHz

HDD: Min,Max,Current: 38 C

Test #2
Maxed Graphical Options Game: Dota2


CPU: Min 83 C, Max 96 C, Current: C0: 86 C, C1->3: 75-78 C
Clocks Unchanged

GPU:
Temp: 78 C
Clock: 730 MHz
Memory Clock: 900 MHz

HDD: Min,Max,Current: 42 C