mirry wrote:thanks everyone. I have run my computer scan a number of times and it says no infected files or trojans. Will try one of those you suggested.
If there is a "clever" rootkit" or other malware hiding aware in the furthest reaches of your system, it is unlikely that programs such as Norton, Macafee or Microsoft Essentials would be able to detect or disinfect. Those types of programs only offer relatively basic defences against malware infection.
If you are choosing to use TDSSKiller and malwarebytes to check then they should be combined with TDSS used first and then Malwarebytes afterward.
Some of the cleverer malware may try and prevent you running TDSSKiller to protect itself from removal. If that is the case you will need to change the name of the executable file (*.exe) to something maybe like mirrycleaner.com perhaps.
Even if you change the name the malware might still detect the program as TDSSKiller and the program may still be unable to run. If that is the case then install TDSSKiller on to something like a USB pendrive and run the program from there. That usually does the trick in most cases.
Do go visit spwarehammer for further advice and support as Taytay said for detailed instructions should the need arise.
For additional advice on developing an effective shield against future infection you could drop by on Wilders Security Forums
. I'm also a member there (under a different name though).
Like I said earlier, it is only a possibility that your pc is infected, but that error dialog you saw is sometimes a good indicator of infection so it is good to check before taking a closer look at any potential problem there may be with operating system files, configuration and/or data corruption.
Edit: Whenever I'm disinfecting systems I always do that in safe mode and recommend that you do the same. Amongst other things, it can help prevent the malware from 'calling home' for new instructions when you are trying to disinfect. (At least that's what I tell myself).