You have a couple of different infections there, including the rather nasty Aurora/Nail.exe infection. Please do the following:
(you should print out these directions, as you will need to stay disconnected from the Internet during the course of the fixes)
Download the trial version of Ewido Security Suite here:
http://www.ewido.net/en/download/
Install it, and update the definitions to the newest files. Do NOT run a scan yet.
Please download Nailfix from here:
http://www.noidea.us/easyfile/file.php?download=20050515010747824
Unzip it to the desktop but please do NOT run it yet.
Next, please reboot your computer in Safe Mode by doing the following:
1) Restart your computer
2) After hearing your computer beep once during startup, but before the Windows icon appears, press F8.
3) Instead of Windows loading as normal, a menu should appear
4) Select the first option, to run Windows in Safe Mode.
For additional help in booting into Safe Mode, see the following site:
http://www.pchell.com/support/safemode.shtml
Once in Safe Mode, please double-click on Nailfix.cmd. Your desktop and icons will disappear and reappear, and a window should open and close very quickly --- this is normal.
Then please run Ewido, and run a full scan. Save the logfile from the scan.
Next please run HijackThis, click Scan, and check:
F2 - REG:system.ini: Shell=Explorer.exe C:\WINDOWS\Nail.exe
Close all open windows except for HijackThis and click Fix Checked.
Restart your computer in normal mode and please post a new HijackThis log, as well as the log from the Ewido scan.