You have been busy and good trouble shooting on your behalf
Have you tried running in Safe Mode at all, if not, can you do so for us.
Swapping in a known good adequately powered PSU or having yours properly tested are the next steps I`m afraid, would you be able to borrow one for testing.
Regarding the high CPU usage;
Download Process Explorer which you can obtain from here
Save it to your desktop then run it (Vista or Win7 - right click and Run as Administrator).
View, Select Column, check Verified Signer, OK
Options, Verify Image Signatures
Click twice on the CPU column header to arrange things by CPU usage, this will put the services with the highest CPU usage at the top of the log.
Wait a minimum of a minute then grab a screenshot and attach it to your next reply for us
Have you tried running in Safe Mode at all, if not, can you do so for us.
Swapping in a known good adequately powered PSU or having yours properly tested are the next steps I`m afraid, would you be able to borrow one for testing.
Regarding the high CPU usage;
Download Process Explorer which you can obtain from here
Save it to your desktop then run it (Vista or Win7 - right click and Run as Administrator).
View, Select Column, check Verified Signer, OK
Options, Verify Image Signatures
Click twice on the CPU column header to arrange things by CPU usage, this will put the services with the highest CPU usage at the top of the log.
Wait a minimum of a minute then grab a screenshot and attach it to your next reply for us