The WIN 7 x64 browser is buggy, what could be the problem?

Question

System administration

Good afternoon, browsers began to blunt very strongly. Animations take place at a speed of 3-4 frames, the scroll freezes, only minimizing the browser, updating the desktop and reversing helps, it helps for a different period of time, maybe for 3 minutes, maybe for 10 seconds, it may not help at all.
I do not know what caused the breakdown, the computer is not mine. Yandex browser was installed.
What I already did to fix it.
1) Reinstalling the browser
2) Replacing the browser with FireFox
3) Cleaning CCleaner
4) ADWcleaner
5) Update flash player
6) Update drivers (video card, chipset, but at the moment there are up-to-date drivers on all devices)
7) Update windows
8) Included turned off the firewall
9) Changed the style to a simplified one (I saw somewhere that it supposedly could help)
10) Turned off hardware acceleration
11) Complete AVAST check
12) In AIDA64 I ran CPU tests, GPU all the rules
The only thing that I didn’t check was the hard drive for bad sectors , but in Victoria HDD in smart with a quick check all the rules.
As a result, nothing helped, browsers both blunt and blunt, the second browser is enternet explorer, but they don’t use it, it blunts absolutely the same as firefox, yandex
The operating system itself works quickly and stably, in the processes LIKE I didn’t find any suspicious rubbish.
When working in a browser, the RAM is loaded at 40-50%, the CPU jumps to 90% when opening a new tab and drops back to 20-30 percent load.
I failed to roll back the system, because there is no operating system restore point.
In other programs, the system behaves well, is not buggy, everything is stable.
Please advise what else can be done.
We will leave reinstalling the operating system as an extreme option.
Thanks in advance )

Answer 1

1. Do a disk check anyway. And it is desirable not from under the loaded Windows. Download some Hiren's LiveUSB, for example.
2. Adwcleaner is good, but not enough. At the very least, check out Malwarebytes Antimalware. It will be very good if you manage to get rid of some Live-USB (for example, from DrWeb). Avast - something like that ... I wouldn't really rely on it.
3. Is this garbage also observed in the private mode of the browser?

Answer 2

There may be a problem with the screw. The CPU doesn't make much of a difference.

Answer 3

Such a problem can be caused by both hardware problems - for example, a faulty HDD, and software ones.
Check the disk, check the drivers for the video card.
Check if there is enough RAM.
Remove unnecessary browser extensions.
Cleaning CCleaner, ADWcleaner is one of the likely causes of this kind of problem.
Try not to use malicious software like CCleaner, ADWcleaner - it helps a lot!