You might need to install 64bit codecs to allow it to run smother. I use k-lite Download K-Lite Codec Pack
They state that you should install both a 32 bit version and then the 64 bit version so i always do the mega and then the 64 bit.
You also might have something running on your PC that is hogging up your bandwidth. Do you know if your NIC is a 10/100 or a 10/100/1000?
To check if something is hogging up bandwidth.
Type resource monitor
On the top you will see tabs. overview, cpu, memory, disk, network. Select Network
Let it run for a minutes then post a screen shot of Processes with network activity
and TCP connections