Question I need to upgrade the RAM and CPU on my laptop ?

[SkyNetRising]

before clean install, can i backup current windows 8.1 os using acronis software

Sure. If you want to.
Do you intend to ever go back to 32bit windows 8.1 ?

i have one doubt, will it take product key automatically

If your laptop was sold with windows 8 preinstalled, then windows key should be written into laptop bios.
During install, if should just take windows key from bios and not even ask for it.

Or you can extract current key from your windows with appropriate software.
Belarc advisor could do that.
I think, there was even a vbs script, that could extract windows key from OS.

 

[jeremyj_83]

I think, there was even a vbs script, that could extract windows key from OS.

I have used this command to get the OS Key multiple times for work.
From PowerShell or elevated Command Prompt: wmic path softwarelicensingservice get OA3xOriginalProductKey

 

[funnyguys]

which processor is faster and better in between these 2 ,
Intel(R) Pentium(R) CPU B940 @ 2.00GHz
intel pentium cpu A1018 @2.10GHz

will pentium cpu A1018 can be fit for my laptop?

 

[JohnBonhamsGhost]

1.i have installed my new 4gb ram in first slot and already existing 2gb ram in 2nd slot, but 2nd ram is different company compared to first ram, suddenly my screen got stucked, and blue screen error coming. is this bcz of two different company rams?

have the issues that had arisen ever been addressed and fixed?

many times mixing RAM modules/kits will lead to system instability, data corruption, or just outright inability to work.
even if they may be the exact same make & model, if they aren't packaged together in a single kit there is no guarantee they will work together.

if running the system with either single module works properly;
return the new module and purchase an 8GB(2x 4GB) kit.