Oliasys Hi.
I think its your isp Roadrunner, Ive had a few Roadrunner uses with a simila
sounding problem, Phone them, ask if there shaping P2P trafic, if they say No, ask for that in writing. they will come clean then.

Also Vista,L/W & Mcfee working together have ishoos, but can be overcome
Im not up on Vista, so look in the L/W Vista forum, or type Vista/McFee in search. that will bring up other posts dealing with that subject.
Peace.

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mickjapa108