Are you running all those instances of Internet Explorer? If not, please do the following;

Download HijackThis Executable from here. Save it to your desktop.
Start HJT & press the "Do a system scan and save a log file" button. When the scan is finished a window will pop up giving you the option of where to save it. Save it to desktop where it is easy to access. Open the log file and then go to the format Tab and make sure that wordwrap is unchecked. Copy the entire contents of the file & paste it into the body of your post. DO NOT FIX ANYTHING YET. Most of what is there is necessary for the running of your system.

Hello! A virus is definitely not out of the question. I presume you use firefox more often, in that case you can disable internet explorer all the same.
Looking at the screenshot IE runs implicitly, apparently started by u and is definitely occupying most of your CPU.

From your query, there is a high probability your system is infected with malware and if this is not resolved ASAP ur system will grind to a halt!

Here are some suggestions:
1) Try getting a copy of McAfee virus scan / Norton Anti-virus (some of these offer a 30 day trial but its best obtaining your own copy) and update this with the latest virus definitions to capture more recent threats.

If you do not have this, and maybe a friend does, ask him/her to scan ur computer using theirs. They will have to access the 'c$' (\\<your Ip address>\c$) share on your computer and run a virus scan on that drive. To accomplish this all necessary permissions have to be granted prior and pcs will have to be on the same network to avoid complexities.

2)In the meantime you should STOP the service running IEXPLORE.EXE.
If you are using Vista, Open up the task manager, right-click on any one of the IE process and select go to service. When on the relevant screen, right-click again and select stop service.
On other systems you may have to manually stop the processes by right-clicking and selecting 'End Process'.

3) You can also set the priority level of the IEXPLORE.EXE to 'below Normal or Low'. This however might be ineffective depending on the nature of malware you have on your system. Since it strives to use most of your CPU thne the malware is self-adjusting.

4)To better manage process runs, i would also look at two sysinternal tools - process explorer. These tools are available for free download from Microsoft Technet, i have supplied direct links to the zip files: Process Explorer: http://download.sysinternals.com/Fil...ssExplorer.zip
and Autoruns (which displays all your processes - at boot time, run time, drivers etc):
http://download.sysinternals.com/Files/Autoruns.zip

Hope this helps and Good Luck!