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Tweak your BIOS
When you first buy your computer, everything is made to be as user friendly as possible. If you turn on your "Quick Boot" option in the BIOS, and make the Hard Disk Boot the highest priority, this will improve speeds

Start up Programs
Having many programs auto-start up when you boot your PC slows it down. By going to msconfig.exe and hitting the start-up tab, you can uncheck all unneeded programs and boost your booting up speed.

Disable Unused Hardware
Your computer loads a lot of drivers when it first starts up, some of which you might not even use. Head into the Device Manager from the Start Menu's search box, and look for anything you aren't using and disable them.

Unused Fonts
When you start up your computer, you load hundreds of fonts and you do not use most of them surely. To hide them, open up the Fonts folder from the Start Menu's search box, and check off all the fonts you don't need. Then click the "Hide" button in the toolbar.

Upgrade RAM
Installing more RAM has always been an effective way of speeding up your computer, and that hasn't changed. RAM is pretty cheap these days, so if you're running low, there's no reason not to stock up and make your computer run a little smoother.

Install a Solid State Drive
These days, your hard drive is probably the biggest piece of hardware in your computer. One of the best upgrades you can make to your computer is to install a solid state drive which can speed up your startup considerably. They're certainly not a cheap upgrade, nor are they without their own maintenance requirements, but if you want to speed up your computer and its boot time, you can't go wrong by installing an SSD

Problem with installing RAM, if your computer cannot handle added ram then it will actually slow down your computer rather than speed it up.

Depending on your computers hardware sometimes less ram is better than more ram. Just something to keep in mind.