Internet download speed all of a sudden SLOW.

Bro i have the same problem.My DL speed was 3.2mb but now is 0.700kb.I check for viruses with almost all programs,check all network and internet options and nothing.MY ISP said there is no problem from theire side.PLS if found the problem send me a mail seifoto@abv.bg I will be greatful.

Is this a wireless or cable setup? You could try using a new cable to see if the one you're using has problems. If it's wireless I would see if someone is leeching off your connection. Note if there's more than 1 person on a 300kps connection there's no chance you're both going to have that kind of speed with a shared connection, especially if you're using a hub, although I do agree a drop down to 20kps is unusual, it wouldn't be if one person is hogging the bandwidth of your connection.

i have been having the same problem with my cable internet connection lately; on our home network my computer is wired directly to the modem/router with 10/100 ethernet, and my step dad's computer only has a little wireless usb adapter plugged into it, and his computer consistently gets about 400 kbps and up with his wireless, while my computer starts at about 250 kbps and gets progressively slower, down to about 20-50 kbps, even though it should be faster since it is hardwired to the modem/router!

mine used to get the same speeds but then one day it just got painfully slow- i've run virus and spyware scans over and over to find nothing; comodo, avast, windows one care, windows defender, mcafee, f-secure, blacklight all come up clean.

the only thing that seemed to help was to "update" my network card driver (under control panel > hardware and sound > device manager > network adapter): this was very strange because when i checked the driver version under properties it told me it had a driver version from 2008, and then when i told it to 'check for updates' it "updated" me to a version that says 2007.
after that it made me restart my computer, and so far my speeds have been back up in the 300 kbps, hopefully they stay that way, so maybe you could try to "update" or "roll back" your network adapter drivers to see if that helps at all like it seemed to do with mine, hope this helps and goodluck ppl!!!