If this problem just recently started you may also want to check with your internet service provider. It may be a problem with their equipment or their connection to your location. They should also have tests available to see if it's a problem with your computer.
My Computer
At a glance
Win 7 Pro 64-bitIntel i5 2.4 Ghz8GB DDR3Intel HD 3000
It's difficult to suggest a magic application if you don't know why your internet speed is slow. If there's a problem with the wiring in your house, or a faulty modem, or a busy ISP server, no application will help you. Have you done any of the Microsoft suggestions or the speed test?
My Computer
At a glance
Win 7 Pro 64-bitIntel i5 2.4 Ghz8GB DDR3Intel HD 3000
Also have you checked your antivirus program lately to see if you have a virus? Or even checked it to make sure it is doing scans?
Also download the free version of Malwarebytes at Malwarebytes.com, install and do a full scan
Virus, Trojans and spyware can slow down a computer via the Internet also
My Computer
At a glance
Windows 7 Pro 32/64 bit and Windows 10 Pro 32...4gigsAMD Radeon HD and Nvidia
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Dell Computers
OS
Windows 7 Pro 32/64 bit and Windows 10 Pro 32 Bit/64bit