Why is the Internet on my laptop so slow?

When I first got my laptop about 3 months ago it was fine. On all other devices such as iPads and iPhones the internet is fine but on my laptop it can't load a web page. I downloaded a few programmes on the laptop and now the internet is extremely slow. I have Kaspersky Anti-Virus and my computer runs on Windows 8.1 Intel core i7 HP Pavilion. I have deleted all downloads and programmes that I do not use or look unfamiliar
Can someone please help me as to why my internet is so slow and how to fix it?

Added (1). It usually comes up with SSL connection error whenever I open the browser.

First of all, I will suggest you to check your internet connection speed. If this is fine, check any firewall blockage or antivirus is blocking any program. If all looks fine, try PC optimizer software to make improvement in system performance. You should first check with processor, corrupt file, many items at desktop. I will suggest you to try some good PC optimizer software that will assist you to improve your system performance. There are many in market but most of them are paid software. I will suggest you to try free PC optimizer - http://www.amigabit.com/powerbooster/free-system-optimizer.html
This is free plus works very well.

These problems will slow your Internet connection because the modem will have problem.

Because your new is slow.

Apart from having sufficient RAM and processing speed below are the few tips to deal with slow internet:

1. Try and user Google chrome Its light weight and fast you can get it for free from the following URL
2. Download any good System Cleaner such as Reginout from Intel Software Directory (http://ibx.intel.com/directory/ ) to clear Browser history and cache because when the cache gets full, your browsing will slow down.
3. Make sure system is free of Mal wares and viruses use Avast free and Malware Bytes (FREE)

4. Sometimes your DNS server is not fast enough you can experiment with some third party DNS server Such as OpenDNS http://www.opendns.com. I tested this with two ISP connections found it very useful with One of them, didn't get much difference in case of second ISP.
5. Always try and use a download manager. There are many free options available
6. Make sure your system firewall in enable and managed to stop unwanted internet traffic
You can control access of programs to internet using windows Firewall

There are several primary reasons could cause your Laptop to be slow and also some softwares you can download to speed up it.
So, use this http://www.computer-speed.info/index.php… to speed up your slow laptop, use a registry cleaner software and clean your registry files first. It will make all the difference, and provide you with the immediate fix you need for your slow computer.Then, download a good anti-spyware to get rid of spyware/adware in your computer.
Do all & check speed here once http://www.scanmyspeed.com/ it will be fast.

You might have downloaded viruses along with those software's, you can fix your computer viruses with amazingly "usbfix" google it and run it. And download C cleaner and run it, i will delete unnecessary files from your computer, i hope you find it helpful.