Hi and welcome to Daniweb forums :).
Can you please do the following.
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Open a command prompt by going to the start menu and then select 'Run'.
In the box that pops up type in 'cmd'. The command prompt will open.
OR
You can go to Start -> Programs -> Accessories -> Command Prompt. Unregister the dll(s) we're going to remove, by entering the following:
regsvr32 /u mob030612.dll
It's ok, if these aren't found or 'error' out. If you want, just copy and paste the individual lines to the command prompt to save typing them in.
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Scan with HiJackThis, then check(tick) the following, if present:
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page = C:\WINDOWS\about.htm
F2 - REG:system.ini: Shell="explorer.exe"
O2 - BHO: IEHlprObj Class - {763BC090-549F-421C-8A39-B1CFEE385812} - C:\WINDOWS\system32\mob030612.dll
O2 - BHO: leezgysrfjqvplrdnihl - {94281daf-c968-4f61-850e-cb743d0769cc} - blank (file missing)
O2 - BHO: TChkBHO Class - {9885FC07-C821-4607-A9A2-5507538BA874} - C:\WINDOWS\system32\tblkwc.dll (file missing)
O2 - BHO: (no name) - {AA58ED58-01DD-4d91-8333-CF10577473F7} - (no file)
O3 - Toolbar: cystrwxssin - {56dc1ceb-8a88-4b33-be52-1f494f4eed98} - blank (file missing)
O3 - Toolbar: (no name) - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - (no file)
Now, close all instances of Internet Explorer and any other windows you have open except HiJackThis, click "Fix checked".
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Locate and delete the following item(s), if present. Make sure you are able to view system and hidden files/ folders:
files...
C:\WINDOWS\system32\mob030612.dll
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Note that some of these file(s)/folder(s) may or may not be present. If present, and cannot be deleted because they're 'in use', try deleting them in " Safe Mode ".
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Reboot.
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Please download the trial version of Ewido anti-malware here:
http://www.ewido.net/en/download/
Install it, and update the definitions to the newest files. Do NOT run a scan 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 run Ewido, and do a full scan. During the scan it will prompt you to clean files, click OK.
Save the logfile from the scan. Restart your computer in normal mode and please post a new HijackThis log, as well as the log from the Ewido scan.