Hi,
Download CCleaner and install it. Do not run it now!
Download and install Ewido Security Suite v3.5 . After download, double click on the file to launch the install process. During installation, under "Additional Options" uncheck "Install background guard" and "Install scan via context menu". Launch ewido by double-clicking the "e" icon on your desktop. The program will prompt you to update - click the "OK" button. On the left side of the main screen, click on "Update" and then click "Start Update". The update will start and a progress bar will show the updates being installed. After the updates are installed, you will see "Update Successful" in the lower left corner.
If you are having problems with the updater, use this link to manually update.
Exit Ewido when done - DO NOT perform a scan yet.
Make Windows to show all files:-
Go to Start > My Computer. Go to Tools menu, click Folder Options. Uncheck Hide protected operating system files. Then, click to select the option Show hidden files and folders. Click Apply and then click OK to exit.
Reboot in Safe Mode:-
Restart (or switch ON) the PC. Then, keep tapping the F8 Key.
From the menu that will be displayed, out of which choose Safe Mode and press Enter.
Run HijackThis and click Do only a System scan.
Then put a check mark infront of below listed entries:-
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.msn.com/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home
O4 - HKLM\..\Run: [usbn] C:\WINDOWS\system32\usbn.exe -go -c6 -w
O16 - DPF: {33331111-1111-1111-1111-611111193457} - file://c:\ex.cab
O16 - DPF: {33331111-1111-1111-1111-611111193458} - file://c:\ex.cab
O16 - DPF: {33331111-1111-1111-1111-622221193458} - file://c:\ex.cab
O16 - DPF: {43331111-1111-1111-1111-611111195622} - file://c:\ex.cab
O16 - DPF: {64311111-1111-1121-1111-111191113457} - file://c:\eied_s7.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{6E86B8A5-6480-4BF8-A12D-0B318B0813A5}: NameServer = 166.102.165.11 166.102.165.13
O21 - SSODL: SystemCheck2 - {54645654-2225-4455-44A1-9F4543D34546} - C:\WINDOWS\System32\vbsys2.dll
Close all other open programs except Hijackthis and click the button Fix Checked in HijackThis.
Exit from HijackThis. Delete these files:-
C:\WINDOWS\System32\vbsys2.dll
C:\WINDOWS\system32\usbn.exe
c:\ex.cab
c:\eied_s7.cab
Run CCleaner, click "Options" button and here go to "Advanced" tab and uncheck the option "Only delete files in Windows Temp folder older than 48 hours". Click OK to exit from the Options. Finally click "Run Cleaner" and click "OK" to continue cleaning.
Run Ewido, click on the "Scanner" button in the left menu, then click on the "Settings", here select the option "Scan every file" and click "OK". Next, click "Complete System Scan" button to start scan. If ewido finds anything, it will pop up a notification. You can select "Clean" and check the boxes "Perform action with all infections" and "Create encrypted backup" before clicking on OK.
Reboot to Normal Mode. Perform an online virus scan at Kaspersky Online Scanner . Save the log it gives after the scan.
Run HijackThis again, click Do a System scan and save log, and post the fresh log along with the Kaspersky log.