Are you sill having the high CPU usage, or any BSODs?
Findings on this issue report that an infected
iaStor.sys can be the cause.
This file is a RAID driver, but it is also the disk controller driver under
Device Manager.
Given the circumstances, let's do the following...
Please download
ComboFix:
http://download.bleepingcomputer.com/sUBs/ComboFix.exe
IMPORTANT!!! Save to your Desktop
<<<
If using a notebook, make sure it is connected to wall-power (AC power), or a UPS system.
Disable any AntiVirus and AntiSpyware applications, since they may interfere with ComboFix.
Info on disabling protection programs:
Topic:
How to disable your security applications - Tech Support Forum
Topic:
How To Temporarily Disable Your Anti-virus, Firewall And Anti-malware Programs - BleepingComputer.com
To run the program, right-click on ComboFix.exe and select: Run as Administrator
Click on Yes, to continue scanning for malware.
The scan make take a while, since it has some 50+ stages.
When finished, CF produces a report.
Please provide a copy of the
C:\ComboFix.txt in your reply.
Notes:
1. Please do not mouse-click the ComboFix window while it is running. This action may cause it to stall.
2. ComboFix may reset a number of Internet Explorer's settings, including making IE the default browser.
3. CF disconnects your machine from the Internet. However, the connection is automatically restored before CF completes its run. If CF runs into difficulty and terminates prematurely, the connection can be manually restored by restarting your machine.