If you can't find the cause, the best thing to do (after 2 months) is to go back to factory conditions and start all over.
Then first thing install Counter Strike again. Only do it from an official paid download or disk, so you can complain if it slows the system down again. If it happened to be an illegal download, don't install it at all, since it probably contains malware causing the slowdown.
I have bought the Acer Aspire VN7-571G about 2 months ago and since a week it started acting very slow.
RAM: 8GB DDR3
Storage: 1TB HDD and 125GB SSD
Graphics: NVIDIA GeForce GTX 950M (4GB)
Processor: Intel Core i7-5500U CPU @ 2.40GHz
I could play games just fine at high frame rates but since I installed Counter strike my pc started to slow down. On counterstrike the game freezes for a sec and continues, i don't get high fps anymore on League of Legends, and even browsing the web goes slowly (not my internet). I checked my Nvidia drivers and they are up to date. And when I check my Ram and Processor usage when I game it never goes over 50%. I don't know if i should get back to the store or if I can fix it.
Anybody that can help me here? Much appreciated