Windows 7: Connection problem in windows 7 only

after setup widows seven for the first time , its really good but there is a problem here with my connection

when i download something , ping become bad "as usual " but when i stop downloading, ping stay bad like im downloading " using IDM" , and even when i buffer something from youtube , connection stay bad and many "request time out" in my ping
and when i restart my pc, connection become so good as it was before downloading !

anyone knows what the problem ? and how i can fix it, thx alot

Do you have any device issues in Device Manager. Any yellow exclamations? Can you also provide more info on what your network setup is?

there is no yellow exclamations , connection didnt get cut when i download , its just become so slow cause of downloading , the problem that after i pause download , connection keep being so bad "like" im downloading

my connection is 1M DSL , not wirless ,
"sorry i'm noob with those stuffs "

Have you tried updating your LAN adapter driver?

the MB's CD not supporting windows 7 ,just vista and XP , and when i tried to update it with vista CD didnt work .... so i didnt update it and i dunno how to update it from internet " MB MSI"
thx for helping btw

Can you read Steps 1-3 of this tut and advice what the PCI\VEN details is for your Intel(R) .... network Connection device, under Network Device Manager.

Driver selection for your Hardware devices.

well i guess its last update ,cause i tried now to update it from device manager it say that i have already the best software and last update

Is you think your network adapter has the optimal driver and it's working the way it should, then a slow internet connection might be your ISP. Do you have another machine that you can test this modem with?

Open up command prompt...
elevate it to admin by right click and run as administrator

copy this into the command line, press enter and then reboot.

netsh interface tcp set global autotuninglevel=highlyrestricted

if it doesn't work out for you, then open cmd again and type:

netsh interface tcp set global autotuninglevel=normal

take a lock and tell me how upgrade it in windows 7 from internet and thx

and my router is speedtouch