dungcoivb trojan, a very sucking trojan (in yahoo).. creates FUN.exe folder

Everytime I am trying to install any software such as: Photoshop, Flash etc. I am getting below message -
"Windows cannot access the specified device, path or file. You may not have the appropriate permissions to access the item." Why?

Click Here to download the current version of HiJackThis.

• Save HJTInstall.exe to your desktop.
• Open Notepad > Click on Format > Uncheck Word wrap, if checked.
• Double-click on the desktop icon for HJTINstall.exe.
• By default it will install to C:\Program Files\Trend Micro\HiJackThis.
• Continue to click Next in the setup dialogue boxes until you get to the Select Additional Tasks dialogue.
• Put a check by Create a desktop icon then click Next again.
• Continue to follow the rest of the prompts from there.
• At the final dialogue box click Finish and HijackThis (HJT) will launch.
• Close any/all browsers, messenger, mediaplayer, Office and mail client windows and applications.
• Click on the Do a system scan and save a logfile button; HJT will then scan and a log showing the results should open in notepad.
• Click on Edit > Select All then click on Edit > Copy to copy the contents of the log to your clipboard.
• Come back here to this thread, right click your mouse and select Paste to paste the log in your next reply.
• DO NOT have HijackThis fix anything yet. Most of what it finds will be harmless or even required.
• Make certain your post shows the entire log, please

To see a tutorial with screenshots on using HijackThis you can click on the link below:
How to use HijackThis to remove Browser Hijackers, Malware, & Spyware

Second:
Please download SilentRunners from here:
http://www.silentrunners.org/Silent%20Runners.zip
Unzip it to the desktop and double-click on it.
Silent Runners will ask if you want to skip the supplementary search.
Please select 'No' to include them.
The program will take longer to run, but will give us more information.
If you get any kind of warning message about scripts, please choose to allow the script to run.
When the scan is finished, a message will pop up and a logfile will have been created on the desktop.
The logfile is named 'Startup Programs' by default and will be located where the program.

Category: Antispyware, Antivirus, Security, Tutorial