Internet activity causes audio cracking

Here is my problem. I own a Toshiba Satellite pro L300-EZ1004x. The laptop is pre loaded with windows XP professional, and I decided to upgrade to Vista Business with SP1. When loading webpages or downloading, My audio/music will crack up until the web page has been loaded or the download is complete. I download DPC Latency checker and noticed that when loading web pages while music is playing, I get multiple bursts of RED spikes up in the 8000us-16000us range. I tried disabling and enabling all devices but the problem still exists. I never had this problem with XP only with Vista. It is incredibly annoying and any help or suggestions would be awesome!
Also i forgot to mention that this problem only occurs when my laptop has been on for a couple hours. When I reboot, the problem goes away until I leave my computer for a while and come back later.
PLEASE HELP!
Computer specs:
Windows Vista Business SP1
Intel Core 2 Duo T5870 / 2.0 GHz
Mobile Intel GM965 Express chipset
Realtek High definition audio sound card
2 GB DDR2 SDRAM
Realtek Network Card
Intel PRO/Wireless 3945ABG

I'm having latency issues as well. However, my issue is all the time and not just when I do something specific. I use my laptop for audio production (mobile DJ) and this has seriously hurt my business.
Using a Satellite P105
Intel Core 2 Duo T7200, 2.0 Ghz
Nvidia GeForce Go 7900GS
Mobile Intel 945 Express chipset
Conexant High definition audio sound card
2 GB DDR2 SDRAM
Intel PRO/1ooo PL Network Connection
Intel PRO/Wireless 3945ABG
I've used the DPC Latency checker as well, and gone through every device disabling and got nowhere. This has been going on now for quite some time & has gotten worse with Service Pack 1 for Vista. Especially, when I try to use an external USB audio device via a generic USB audio driver. I have been trying to resolve this issue for months now & have found MANY, MANY, users encountering these issues with Vista. Wireless cards are a big cause for many, but I have found that there are a variety of causes to the issues. The majority come down to incompatability between Vista and motherboards, chipsets, processors, and video drivers. Speedstep technology also playing a part in serveral cases. I have followed the suggestions of many that have resolved the issue, but have not been able to get anywhere. In all of my research I have noticed that most of the cases that have been resolved came from manufacturers issuing BIOS revisions specificly revised for the issue. I have convinced myself that Toshiba needs to do the same. The last BIOS revision for my model that Toshiba put out didn't go so well for me anyways. I was able to up-date it, but I did NOT like the way it behaved upon flashing it, and performance has gotten worse since then.

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