Johnstone

Hello,
Problems with my internet connection.

Got Telia 8mbit connection about a month ago, very smooth when using internet explorer. The problem is, as soon as i open up bitlord or utorrent or any other 'downloading program' the connections gets very unstable. I've beeing pinging www.google.se for a while and one every second line or more i get a timeout.
This means i can't be logged on to msn and internet is veeeery slow plus all these timeouts disturb the download making it impossible to go above 100kb/s.
I've forwarded the ports on my router, and sometimes, if im lucky the downloads will go smooth for a few minutes...
I also want to add that I don't have these downloading issues from internet, the speed from rapidshare and such are at 700-900kb/s.
The Router that im using is called 'Netgear RP614v4'. It also seems to be a difference in timeouts depending on different files im downloading, but i guess that can't be right..
I'm thankfull for all answers and any suggestions are welcomed, this is getting on my nerves and I hope that some kind soul out there might be able to help me.

PS. Sorry about the english, I'm from a non-english speaking country.

Regards, Johnstone