go to cmd prompt and enter the following
netsh winsock reset
netsh winsock reset catalog
netsh interface ip reset C:\DAF-interface-resetlog.txt
netsh interface reset all
netsh firewall reset
reboot your pc.
go to bleepingcomputer.com download malwarebytes update and run a full scan.
see if you still have problems
just check my internet speed before doing your steps and it is being fast again it weird how being like dial up speeds to suddenly being fast