I purchased a new laptop about a week ago, and have been having numerous issues with windows 7, including the wireless internet being insanely slow. I've tried other wireless adapters to no avail, and every other computer in the house, be it wireless, or not runs perfectly, with the speed tests all running about the same(D/L speeds at 10Mbps), while this laptop runs at about 1/4 of the speed. I can only assume it's some sort windows settings, and not anything to do with the ISP or the router because of such.
To add, and I don't know if this will be of any use, but while doing regular browsing, the speeds are fine, you can't really notice a slowdown. But when viewing videos or downloads, it tanks. I've noticed my download speeds start out, and stay at their max speed (about 1.1MBps) for say 5 seconds, only to sink to about 250-300KBps for the duration.
I don't know what info dumps are needed, but I will try and provide any info I can if necessary.