Download Speed

About a week ago I had very good speed for downloading but today my both pc’s were acting slow and when I checked their download speed it went down a whole lot. Look at this in just 4 days.
From This:

To This:

Can anybody help me find out wats wrong or at least help me fix it?
Answer #1
Tried contacting ur ISp ?
Run a full system virus/ trojan check
Answer #2
there have been many cases lately i have seen in the help desk i dunno hwy
your upload speed stayed the same but your download is different, maybe your isp is fizing some stuff or something
also i can help your life half way: Use this program called Internet Download Accelerator…..just search for it
Answer #3
Same thing is happening to me; it has dropped from an average 7mbps to 2mbps; maybe the whole worldwide Internet is breaking down
Answer #4
Ok it has gona up. My new speed=9,503 kb/s and 490kb/s ms=34