So earlier on my other computer account my internet was fine, then it suddenly started going so slow, and I tried downloading something and it was downloading at around 5.5 kb/s when my download speed is usually 1 MB. On my other account which I'm on now the internet runs fine, what's wrong?

speedtest.net helps you figure out your downloading/uploading speed. There might be a problem with your internet connection.

Contacting your internet provider is the best option.