I have a laptop HP probook 4520s with

Core i5 M480 @ 2.67Ghz,
4Gb RAM,
640 GB HDD Radeon HD 6370m 1GB video card.

It would seem like a good stack for work, right? But My HDD has crashed after everyday walking with laptop about 1 year.

After buying my new SSD (Patriot memory - Torqx II 128 Gb SATA II) and installing new Windows 8 from scratch - it was amazing fast. But I had only install windows updates, and I feel that the speed become the same as my old HDD, after install other software for my work, it becomes so slow, so when I use my PC with old lower configuration and it really works better than my awesome laptop... I checked that TRIM and AHCI mode are turned on. So why's that?

I asked for help in Patriot Memory support, they suggested to send them ATTO test results, done, sent. Here is the response:

"Thank you very much for the attached results. Looking at the results, I can see that your SSD speed is a lot lower than it should be. Can you tell me your system specs?"

Until they checked my email, I re-installed Windows 8 to Windows 7 and it was again perfect, but the story repeats it becomes slower and slower after every installing new software. Check out some screenshots..

(sorry for the screenshot with russian TaskManager, I hope you will recognize those parameters accordingly with your english or other lang TaskManager)

So the main issue that something everytime loads the disc on 100% and the response time is jumping around 1000-3000 ms.

Why am I asking about Windows? Because I tried to install Linux Mint (x86) and It just flies. So great performance independent on how many programs I have installed. Only Windows (any 7 or 8) has this problem.

So guys, I appreciate any ideas about how to fix that and may be answers of main question - "why is it so.?"

Thanks!