On this computer...
Product: ThinkPad T60 2623-D6U
Operating system: Windows XP Pro
Original description: T2400(1.83GHz), 512MB RAM, 80GB 5400rpm HD, 14.1in 1400x1050 LCD, 64MB ATI Radeon X1300, CDRW/DVDRW, Intel 802.11abg wireless, Bluetooth/Modem, 1Gb Ethernet, UltraNav, Secure chip, Fingerprint reader, 6c Li-Ion batt, WinXP Pro
In firefox 3.6.3 with updated flash player, and internet explorer 8, hulu videos stop and start, and eventually stop. Youtube videos stop at random points and won't start again unless I drag the progress bar, then they play fine until another stopping point. The youtube videos show the usual "hourglass" of dots going in a circle, when it's stuck.
Downloads in IE get stuck, whereas downloads in firefox get stuck, and if I click paus, and unpause, they resume until they get stuck again.
This happens with both WIRELESS only and ETHERNET only, connections. (So I didn't bother updating the network adapter drivers - plus I can't download them.)
It happens in normal mode and in safe mode with networking as the admin user.
I tried deleting temp internet files, which didn't help. The hard drive is NOT full.
I don't know if this is relevant, but I noticed that at one point, webpages were loading ok and I could ping them ok, except for youtube.com, which I couldn't even ping. Then about 2 mins later I could load and ping youtube.com.
At one point I had a file downoad window, and ie8 flash video, and two firefox flash youtube videos playing. The file download got stuck first, then ie8, then the first youtube vid, then the second youtube vid. Then at that point the network graph in task manager drops to nothing.
At no point does performance monitor show that the cpu, ram, hard drive or page file are working particularly hard (as far as I can tell!).