Laptop Does Not Load Websites

I currently have an Acer Aspire 5100-5728 laptop with Windows Vista Home Premium installed on it. After very many months of usage with no problems pertaining to the internet, I am suddenly met with an inability to load internet websites in an acceptable time. Other programs such as Pidgin (Instant Messaging client) and uTorrent (BitTorrent client) that use the internet work flawlessly; my download/upload and data transfer speeds are not affected at all, and according to the Network and Sharing Center, I am connected.Anything in the browser bar, including my router setup, or the IP addresses of websites, take anywhere from three to ten minutes to load; sometimes they just fail to load entirely.this includes low-content pages such as Google, Bash.org, and various other websites. I've tried both Mozilla Firefox and Internet Explorer, and the problem is consistent. However, the problem is only specific to my machine; I am currently typing this up on my parents'Acer Aspire, connected to the same network, and websites load with no problem.

I've tried the following:
-Rebooting the machine
-Resetting the modem
-Unplugging the router
-Changing router settings
-Resetting the network settings
-Using wireless/wired
-Flushing the DNS
-Clearing the browser cache

I've also checked the Acer website, and it doesn't seem that there are any driver updates or anything of the sort.I can speculate that the problem is not with my ISP or any of the networking hardware. The various other computers in my house (running Windows Vista, Windows XP, and Ubuntu) all have full connectivity; it is only one Vista
laptop that has this problem.