Still going through your log but first...you don't say how much RAM you have installed on the computer. Need to know that, PLUS did you purchase this computer with Vista installed or did you "upgrade" from a previous OS? Have you done a good cleaning of the inside and outside of the computer itself? Dust build up, which happens to ALL computers can really cause things to heat up and since you mention excessive heat this is definitely one thing to look at. You don't say if this is a tower or laptop but clean all vents and areas around the fan. If it is a tower open the tower and blow out all the dust.

Here are a couple things to try to reduce the high CPU usage; These are from BlackViper Super Vista Tweaks
Disable the Indexing Feature: With the default Category Control Panel:
  1. Head to Start
  2. Select Control Panel
  3. Select System and Maintenance
  4. Select Indexing Options
  5. Select the Modify button
  6. Select the Continue button (if UAC is active)
  7. Select the Show all locations button
  8. Select the Continue button (if UAC is active)
  9. Double click "Users" in the "Summary of selected locations"
  10. Uncheck Users directory
  11. Double click "Start Menu " in the "Summary of selected locations"
  12. Uncheck Start Menu directory
  13. Select the Ok button to close the panel
The new Windows Vista Sidebar uses between 12MB and 20MB of RAM with the default 3 Gadgets and no news headline feed.
Desire to disable the Sidebar? Several ways exist, but here are two of them:
  1. Locate the Windows Sidebar icon in the System Tray (lower right, near the clock display)
    1. Show hidden icons if it is not displayed
  2. Right click the icon to bring up the context menu
  3. Select Properties
  4. Uncheck Start Sidebar when Windows starts
  5. Select the Ok button to apply the settings
You can disable the Sidebar also by:
  • Right click on an unused area of the Sidebar (between Gadgets or at the bottom) to bring up the context menu
  • Select Properties
  • Uncheck Start Sidebar when Windows starts
  • Select the Ok button to apply the settings
If you wish to close the Sidebar now:
  1. Locate the Windows Sidebar icon in the System Tray (lower right, near the clock display)
    1. Show hidden icons if it is not displayed
  2. Right click the icon to bring up the context menu
  3. Select Exit
or:
  • Right click on an unused area of the Sidebar (between Gadgets or at the bottom) to bring up the context menu
  • Select Exit
These are just a couple of his suggestions. Usually he is "right on". So much of Vista just seems to eat away at resources on the system. He has lots of tips there which really work. I have followed his tips for XP and have had great success with them.