Ok your speeds coming from your ISP are more than adequate for watching videos and downloads.
Do both machines suffer from this trouble or just the laptop?
This can't be your Desktop PC causing the issues it has nothing to do with that PC as your getting fast speeds its leading me towards thinking you have a faulty router or network card, but a faulty router is more likely.
Mystic Mod - Putting the fear back into sliced bread since 4th May 2010
Windows 7 Pro, Intel Core 2 Duo 2.8Ghz, 4GB DDR3, Dual nvidia SLI 9800GT 1GB, 1.5TB Hard disk