Vista takes a lot of RAM and CPU cycles even if you are not running an application. Main sink for power and RAM is the Aero graphics engine, which makes it look beautiful without doing anything else. As a result, you will see your RAM and CPU usage jumping higher and higher as soon as you start an application. Disable all the visually-pleasing effects.

Also to blame is Superfetch. It is Vista pre-loading your most commonly used applications in the background (among some other factors). It’s designed so that it will leave you with a specific percentage of RAM remaining so that it doesn’t cause performance issues. If more RAM is needed, it releases some. The idea behind it is to allow programs to launch much faster and keep your hard drive from fragmenting as quickly since the apps are used (at least by the OS) in a more ordered manner. If you have less than 2 GB of RAM, you might be better off turning off Superfetch.

RegCure is a faker. See here to know more about its authenticity.

Try changing your SATA Configuration to AHCI in BIOS options. Few people have reported faster performance and increased system responsiveness by doing so.

Or, it could be because of the Microsoft Audio Endpoint Builder service. Try disabling the ATI HDMI Audio driver by going into Device Manager, under ‘System Devices’ there would be a “High Definition Audio Controller” (if it applies to you).

The log seems clean except for RegCure. Check the Processes tab and see which process is hogging the CPU.

REGCure= Spyware Blah….
ZoneAlarm= CPU intensive

Under Task manager in the processor tab should show which application is using the cpu