How can I recover deleted files in Windows?

Any help is appreciated.

I don’t know about safe mode that comes with windows how it works what is the advance side of it how can it help me.

Now a days, I am having problem with virus.  They hide my files and folders. So tell me how to see hidden files and folders in Windows 7 and how to recover files.

I don’t know what happened to all the files in my computer, I did 10 documents and all of those files where deleted and I don't know where are those files. Someone help me how to look back everything. If its possible. 

how can i change windows 7 desktop background and also please tell me how to change my windows 7 theme like I did in windows XP.

how can i change windows 7 desktop background and also please tell me how to change my windows 7 theme like i did in windows xp.

i am new in Windows 7 now tell me how to know my video memory. then please tell me how to know and change my display resolution.

I have a system that I built which I, conveniently, did not install an optical drive in as i'd like to keep the case as nice looking as it can and an optical drive will just make it a bit ugly. I also don't want to spend money on an external optical drive as it costs more than it useful especially these days. I was wondering, is there is a way to install Windows 7 on my computer using a usb flash drive/thumb drive?

Hello,

Why I'm always getting Windows 7 update almost everyday?

It's taking so long before I can use my computer because of many updates and after installing updates, it asks me to restart my computer.

What will I do to stop this?

It is really a waste of time because when I shut down my computer, there's like 110 updates to be installed and that's always happening when I shut down my computer.

Please help me. 

Thanks.

Screenshot of computer update.

Error:

I have installed Linux Mint Julia.

And when I start the PC Mint boots automatically without giving any option of booting Windows7.

I have also searched on internet but nothing came across me. 

Please help me in this problem.

Thank you