This used to be a mystery until I found a solution few years ago. And it is proven good by myself.
The brand, A4tech. Taiwan brand.
My computer and my family's are/were using OP-720 p/s2 port mouse for quite some years already. They are still functioning though.
This is the picture: I get this mouse at RM25 years ago.
My brother owned a silver model, I owned a black one, and my family computer is installed with another black mouse. All of them are working well, even the left-click button sounds properly. You know, the clicking sound may go off after few months.
Just to emphasize it: I am a heavy DotA gamer, and this mouse accompanied me for more than 6 years, including those days I stepped into DotA world, yet it is still FUNCTIONING properly! You can imagine how many millions of clicks I had use on it.
I know they are just a normal 800dpi mouse. If you want something more than that, this model is not what you want. Yea, OP720 is not available in market anymore. So here I recommend this newer model, I trust this one: OP-620D.
www.cpubenchmark.net It's a website currently having >35,000 types of CPU tested. The database is perfect to me as I am the one who likes to compare apple to orange, durian to pineapple. Why am I talking like that?
This is because there are a lot types of processors for different end-usages. Some are designed for high performance like i7 and i5, mediocre like i3, low cost and TDP like atom, and of course, AMD products in competition.
In this new age of technology and processors, we cannot just compare the products according to clock rate it supports - An Intel Pentium IV 1.8GHz processor is lost to Intel Pentium III 933MHz. From this website, I can find out almost every single processor I know (I think excluding Pentium III lower than 533MHz, and below).
From here, I know my beloved Atom Cederview D2700 processor performance (848) is slightly below than Intel Dual-Core T2400 processor (884). Seems good. Hopefully it supports DotA2 well in terms of CPU performance.
For GPU, that ASUS lamborghini notebook's GPU Radeon HD 6470M is rated as high-end. That's whoa! So, so unexpected. That ASUS lamborghini VX6S wins every atom models for the time being, especially in GPU field - that's how many times the performance of AMD Fusion E450/350, Nvidia Ion, and Intel GMA.
There are a few cases happening around me: because formatting the Windows OS is the easiest way to fix, those working in computer service center keep urging customers to format all their data (maybe just the c drive, but the drive can mean everything too).
*this works for all drives and folders being locked up - cannot access them by default*
I usually boot Ubuntu from pendrive to attain all the datas into another external HDD. It is that simple to know the concept.
To regain the permission for all locked drives/folders, in terminal (Linux version of Command Prompt), 1. Type "sudo passwd root", then enter. 2. Type any password you want, even "123456" works. 3. Log out of current session, then log in as "root" - which means administrator. 4. You can access all the locked drives and folders. It's time to copy them out into safe locations.