Hello, I'm pretty rubbish with all the technical stuff to do with computers...

But wondering if anyone could help...
My internet connection is generally 7.1mb (i think i've put that right...)
I did one of those speed test things at Speedtest.net it said 3617 download... 214 upload
yet I did another one it said something like 1700 download
Anyway, the real problem is that download speeds are pretty much maximum at 5kb/s which I know isn't right because I used to have a set 2mb connection years ago and downloads were around 200kb/s then.. I have put up with this over the last few years because I hardly download but just wondering whether anyone knows what is happening??
Many Thanks