How To optimize DSL-CABLE connection speed

First, u need to goto 

Start, then run. Type in regedit in the box. 
Next, goto the folder HKEY_LOCAL_MACHINE\System\CurrentControlSet\VxD\MSTCP

Now, find the string DefaultRcvWindow . Now, edit the number to 64240 then restart your computer. There you go. 

High speed cable modem now with out dloading a program. 
Original value is 373360