Again this is my opinion, you can bash me all you want, But... Installing new drivers over all drivers and in different order can make a system unstable. Here is what I recommend.
The Radeon requires a special install to make everything work aaahhhh better. Just follow these steps and see if this helps. Also are you behind a firewall by any chance?
1. If you have an Asus board, update your bios to 1005C or later.
(Important, follow update instructions)
Once the bios update done, hard boot and go directly into bios again. Reset the defaults, save and.
HARD boot again, goto bios and then modify your bios as you want. save and Hard boot again.
2. re-Download DX8, VIA 4-1 v4.28 (if you have a VIA chipset) and the 4.13.7068 ATI drivers.
3. Uninstall all ATI components using Add/Remove Programs in Control Panel
4. Locate the ATI Multimedia folder in C:\Program Files, and remove it
5. Do a Find Files and delete any ATI*.* files that you think should not be there.
6. Restart Windows (in VGA mode)
In this order.
7. Install the Via 4-in-1 v4.28 drivers from
http://www.viatech.com/drivers
IMPORTANT: make sur AGP support is loaded in Standard mode (not turbo)
8. Install (or re-install) the latest version of DirectX (8.0) even if you already have it installed.
9. Install the latest ATI display drivers, AND do not restart or reboot your system.
10.Search and locate ATIGART.exe (in the ATI/Gart dir) and rename it to OLDGART.exe
11.From the CD - Install the ATI Multimedia Centre ONLY, no drivers or VGART.
12.Restart the system, set your video defaults.
Hope this helps.