Windows 8

Lock Screen:-

Windows 8 opens on its lock screen, which looks pretty but unfortunately displays no clues about what to do next.

It's all very straightforward, though. Just tap the space bar, spin the mouse wheel or swipe upwards on a touch screen to reveal a regular login screen with the user name you created during installation. Enter your password to begin.

Basic navigation:-

Windows 8 launches with its new interface, all colourful tiles and touch-friendly apps. And if you're using a tablet then it'll all be very  straightforward: just swipe left or right to scroll the screen, and tap any tile of interest.
On a regular desktop, though, you might alternatively spin the mouse wheel to scroll backwards and forwards.
And you can also use the keyboard. Press the Home or End keys to jump from one end of your Start screen to the other, for instance, then use the cursor keys to select a particular tile, tapping Enter to select it. Press the Windows key to return to the Start screen; right-click (or swipe down on) apps you don't need and select Unpin to remove them; and drag and drop the other tiles around to organise them as you like.

App Groups:-

The Start screen apps are initially displayed in a fairly random order, but if you'd prefer a more organised life then it's easy to sort them into custom groups.

You might drag People, Mail, Messaging and Calendar over to the left-hand side, for instance, to form a separate 'People' group. Click the 'minus' icon in the bottom right corner of the screen to zoom out and you'll now find you can drag and drop the new group (or any of the others) around as a block.
Right-click within the block (while still zoomed out) and you'll also be able to give the group a name, which - if you go on to add another 20 or 30 apps to your Start screen - will make it much easier to find the tools you need.

Quick Access Menu:-

Right-click in the bottom left corner (or hold down the Windows key and press X) for a text-based menu that provides easy access to lots of useful applets and features: Device Manager, Control Panel, Explorer, the Search dialog and more.

Find Your Applications:-

The Win+X menu is useful, but no substitute for the old Start menu as it doesn't provide access to your applications. To find this, hold down the Windows key and press Q or either right-click an empty part of the Start screen or swipe your finger up from the bottom of the screen and select 'All Apps' to reveal a scrolling list of all your installed applications. Browse the various tiles to find what you need and click the relevant app to launch it.

Shutting Down:-

To shut Windows 8 down, just move the mouse cursor to the bottom right corner of the screen, click the Settings icon - or just hold down the Windows key and press I - and you'll see a power button. Click this and choose 'Shut Down' or 'Restart'.

Some of the tricks available in previous versions of Windows still apply. Press Ctrl+Alt+Del, for instance, click the power button in the bottom right-hand corner and you'll be presented with the same 'Shut Down' and 'Restart' options.
And if you're on the desktop, press Alt+F4 and you'll be able to choose 'Shut Down', 'Restart', 'Sign Out' or 'Switch User' options.

What's running?

If you launch a Windows 8 app, play with it for a while, then press the Windows key you'll switch back to the Start screen. Your app will remaining running, but as there's no taskbar then you might be wondering how you'd ever find that out.

You could just press Alt+Tab, which shows you what's running just as it always has.

Holding down the Windows key and pressing Tab displays a pane on the left-hand side of the screen with your running apps. (To see this with the mouse, move your cursor to the top left corner of the screen, wait until the thumbnail of one app appears, then drag down.)

And of course you can always press Ctrl+Shift+Esc to see all your running apps in the Task Manager, if you don't mind (or actually need) the extra technical detail.

Closing An App:-

Windows 8 apps don't have close buttons, but this isn't the issue you might think. Apps are suspended when you switch to something else so they're only a very minimal drain on your system, and if you need the system resources then they'll automatically be shut down. (Their context will be saved, of course, so on relaunching they'll carry on where you left off.)
If you want to close down an app anyway, though, move the mouse cursor up to the top of the screen. When it turns from the regular mouse pointer to the icon of a hand, hold down the left mouse button and drag it down the screen. Your app should shrink to a thumbnail which you can drag off the screen to close it.
If that's too much hassle, then simply pressing Alt+F4 still works.
And when all else fails then press Ctrl+Shift+Esc to launch Task Manager, right-click something in the Apps list and select End Task. Beware, though, close something you shouldn't and it's easy to crash or lock up your PC.

Mastering Internet Explorer in Windows 8:-

Click the Internet Explorer tile from the Start menu and you'll launch a full-screen version without toolbars, menus or sidebars, which like so much of Windows 8 may leave you initially feeling lost.

Right-click an empty part of the page or flick your finger down from the top of the screen, though, and you'll find options to create and switch between tabs, as well as a Refresh button, a 'Find' tool and the ability to pin an Internet shortcut to the Start page. Click the spanner icon and select 'View on the desktop' to open the full desktop version of Internet Explorer.

Run two apps side by side:-

Windows 8 apps are what Microsoft calls "immersive" applications,which basically means they run full-screen - but there is a way to view two at once. Swipe from the left and the last app you were using will turn into a thumbnail; drop this and one app displays in a sidebar pane while your current app takes the rest of the screen. And you can then swap these by swiping again.

Uninstall easily:-

If you want to hide an unused app for now, select 'Unpin from Start'. The tile will disappear, but if you change your mind then you can always add it again later. (Search for the app, right-click it, select 'Pin to Start'.)

Or, if you're sure you'll never want to use an app again, choose 'Uninstall' to remove it entirely

Administrative tools:-

Experienced Windows users who spend much of their time in one advanced applet or another are often a little annoyed to see their favourite tools buried by Windows 8. Microsoft has paid at least some attention, though, and there is a way to bring some of them back.

Open the Charm bar by flicking your finger from the right-hand side of the screen and select 'Settings' then 'Tiles'. Change 'Show administrative tools' to 'Yes' and click back on an empty part of the Start screen. And it's as simple as that. Scroll to the right and you'll find a host of new tiles for various key applets - Performance Monitor, Event Viewer, Task Scheduler, Resource Monitor and more - ready to be accessed at a click.

How to Enable/Install Dot Net framework 3.5 on Windows 8 Without Connecting Internet.

Step 1: Insert the Windows 8 disc.
Step 2: Run Command Prompt (cmd) as Administrator.
Step 3: Now, just copy and paste the below code (the G on Blue  color is your Disc Drive letter, replace it with your disc drive letter) on command prompt and hit 'enter'       

dism.exe /online /enable-feature /featurename:NetFX3 /Source:G:\sources\sxs /LimitAccess

Step 4: When its successfully done, restart your PC and enjoy!