I have come to you as my last resort. Even though I only bought my computer under 2 months ago, there are problems already. Big problems. Here's the story (what I think is the cause):

I am running WinXP HE SP3, on a relatively high end computer (specs listed below). A few days ago, my friend tells me that I should get better AV than what I am currently using (AVG). He tells me that he is running SUPERAntiSpyware, Malwarebytes' AntiMalware, Avira AntiVir AND Avast. All at the same time. His computer seems to be running fine, so I agree. That night, I download all of those and install them, removing AVG. The next day, I removed all except AntiVir and SuperAntiSpyware after noticing extreme startup hangs in excess of 5mins staying on the "Welcome" screen. The computer seemed to be running excessively slow, so I tried to restore. Whenever I tried, it told me after the restore that it was incomplete. From there I just uninstalled all AV programs and am now using Avast. However, I still get CPU spikes. When I am idle, and monitoring the Task Manager, it's jumping from ~2% to ~40% (image attached below). I noticed that when I am using Firefox and iTunes (I am running iTunes 99% of my computer usage times) the CPU usage spikes to ~100%. My music stutters, and the whole computer freezes for a few seconds, then returns back to its normal state as if nothing went wrong. I have disable ctfmon.exe on startup, I have reinstalled my audio drivers, reinstalled iTunes, scanned my system with multiple virus scanners, and I am losing faith. Another odd thing that happens, is my CPU sometimes drops down to 0%-2%. When this happens, and I am running iTunes and Firefox, my computer freezes for ~20 seconds, and the music stops playing (as opposed to when it spikes, the music stutters).

System Specs:
Intel Core2 Duo E7400 @ 2.80GHz
Foxconn P31A-S Motherboard
4GB DDR2-800 RAM
nVidia Galaxy 512MB DDR2 128-bit
Realtek HD Audio Drivers
500W PSU
500GB HardDrive
Windows XP Home Edition SP3
Avast Home Edition

Please I am desperate for solutions. Help me out here?

Image: CPU when running idle.
h t t p ://s688.photobucket.com/albums/vv241/SimonSiknasty/?action=view&current=untitled1.jpg

AshServ.exe was at one point 17 (and has 23000K mem usage peak at 123000K)
iTunes.exe usually at 00, then sometimes at 02/03
uTorrent (I'm downloading atm) alternating between 00, 02 & 03
DisplayLinkManager.exe comes up every 10 seconds or so at 02

(This is me running normal if that helps)
I will prepare for shutdown and see what it looks like now)

Well as Bobbye stated you only require 1 Antivirus and you have mentioned 3 (AVG Avira and Avast)
Plus you are downloading uTorrent "atm" Um Why ?

You may want to read here on P2P File Sharing Programs: http://www.techspot.com/vb/topic124748.html



But I would highly recommend you go through this guide: UPDATED 8-step Viruses/Spyware/Malware Preliminary Removal Instructions

And also note this quote from the guide:

If you decide on removing all P2P programs and then uninstall all but 1 Antivirus, and then go through the guide, you will then need to create a new thread in the Virus & Malware removal forum, if you want your logs checked

I uninstalled my uTorrent. But I last downloaded something several weeks ago. This problem started days ago, so it can't be my P2P that is causing the spikes. I talked to the man who made my computer (XtremeSystem) and he suggested a defrag. I decided to run an Avast boot scan, and that is running at the moment (I'm on my friend's computer). Surely, if it is a virus that is slowing down my computer, then the boot scan will detect it.
Also, what would be causing the startup hangs? The other night, I restarted, and it took 10 minutes to go from the 'Welcome' screen onto my desktop.
I installed Photoshop CS4 the other night, and went to sleep waiting for it to install because it was taking so long. Please I need suggestions.

Sorry you may have misunderstood

The 8-Step guide is to help rid you of Virus and Malware (Trojans, Spyware; Adware ... etc)

I provided the correct advice
Note: Defrag was not it

So would the virus be causing a start up hang?
And do you think that Avast should detect and remove the virus on the boot scan it is currently running?

As you had P2P installed I'd say it's a large possibility that Malware is present

So did you want it fixed, or do you want to keep asking questions? Because there are lots and lots of what ifs, and do you think, that we could ponder over all day!

Ok. I ran the Avast boot scan. It finished before I got home. I know that looking in my Avast Virus Vault, there are only 3 files in there:
kernel32.dll
winsock.dll
wsock32.dll

I still get CPU spikes, just not as frequently.
Currently, my computer is at reasonable speed, but still noticeably slower than it used to be.
An issue that I seem to be getting more frequently, is when my CPU drops to ~0%. Everything freezes (first off iTunes, then everything follows suite) and it's about 10 / 15 seconds before it returns to normal. However, when this happens, my iTunes doesn't stutter, it just stops all together. I'm running Malwarebytes' AntiMalware at the moment (full scan) and I will attach the log.

Thanks, that's great news that you are making progress

By the way, make sure to make a New Thread as stated in the quote below

What's happening with the CPU drops though? :S

Okay. I am sure this isn't virus related. I ran AntiMalware full scan... No viruses found.
Avast Boot scan... No viruses.

But.
Just before, I had a BSOD.
It said as that my computer has been shut down to prevent critical damage...
Blah blah blah
Stop: 0x000000F4 (0x000000003, 0x8A9BA304, 0x8050297C)
Beginning Physical Memory Dump.

I pushed the restart button on my computer before it said that the Memory Dump had been completed.

Misconfigured Hard Drive or CMOS settings

Start with that I must rush off

Yes you could be right it might not be malware then ! Grrr.

I shall await your return before I delve into the matter. I don't want to damage anything. How will I tell whether it is HDD or CMOS?

Hmm I'm back
That was one of my longer delays so sorry about that ie I'm usually always on (just about)
Anyway, depending upon your hardware knowledge, you could try the below:

Reset CMOS settings to defaults (usually it's DEL to get into CMOS whaen your computer first starts)
Run a CheckDisk on your C Drive
Test without CDRom Connected to Motherboard
Check for any recent Minidumps in C:\Windows\Minidump folder (you can attach one or two as well)
Clean up your system, ie Run CCleaner even KCleaner
Download and run KCleaner http://www.techspot.com/downloads/4755-kcleaner.html (disregard any A/V warning)
(uncheck RelevantKnowledge during install, pic here: http://i42.tinypic.com/aloy8z.gif)
Fully run, ie select all (it says start actually )
Then Restart
Run a Drive Diagnostics on your HardDrive on your Drive

That's a good start

Edit:
Oh about your Poll thread, I prefer Avira and that's what I currently use (if that helps your decision)
.