The only way to solve the problem is to try different things to either find a solution or rule out possibilities.
The two best proposed solutions I have seen so far in this thread is to temporarily disable Windows Firewall, and to try another browser (if using Internet Explorer, I would recommend Google Chrome). Please do not follow the suggestions to format C:\ or to install Linux Mint., unless you want a whole new set of problems.
Also, you did not mention if you are having any other problems besides slow links in the browser.
I would also try the following:
- Bring up the same web pages in the browser's incognito mode and test the links.
- Check speedtest.net to check your Internet speed
- If using a WiFi connection, try temporarily using a wired Ethernet connection
- Temporarily disable your Virus scanner and test links in the browser. Only try this with a very safe site such as the Google Help page, and remember to immediately enable the Virus scanner afterwards.