Hi, Kaspersky installation doesn't affect your internet connection . Due to any one of the following reasons your internet gets slow down ;
1. Local network is overloaded
2. Malware or scareware on end users computers
3. Bad connection
If you want to increase your internet speed, use the following steps :
1. Secure your Wi-Fi
If your Wi-Fi is not password protected, anyone can use it. This means that people might be logging onto your network without you knowing, causing speeds to drop as a result.
Fortunately, most providers now automatically supply you with a password-protected router, but if you don't have one set up, or have turned the password off, secure your network immediately.
2. Clean up your computer
There are tons of applications on your computer that could be using the internet, possibly some without you even knowing it.
Windows updates, security scans and updates, media player pop-ups, instant chat applications, Skype, open website tabs and more - all these things can eat away at your broadband speed.
To boost your speed, shut down services you don't want, as well as any bandwidth-heavy streaming services like BBC iPlayer and Spotify when you're not using them.
3. Get a powerline adapter
Powerline adapters use the electricity power lines in your house to boost your signal from room to room. These are particularly useful if there are rooms in the house where your wireless signal is weak.
4. Switch broadband
If you find that your connection is still slow, switching to another provider is possibly the best solution. Companies should be able to do a line test
After competing the above task you can check your internet speed by using Scanmyspeed.com