Possible virus on my laptop - not sure what to do?

[Cazgogo]

Yesterday I spent most of the afternoon on internet explorer, my search engine is google.  I had no problems until I started searching music sites for dance compilation albums.  When I clicked on the first search link that came up, another window opened up stating that spyware had been located and seemed to be undertaking a scan of my computer.  It stated that trojan viruses had been located with various dates, some dating back to last year.  Then another window opened asking if i wanted to remove all infections, and when I clicked on "remove all" another window came up with a programme that needed running, but every time I clicked to cancel this download it kept taking me back to the window to "remove all" and it would not let me close that window.  In the end I closed my computer down my pressing the power button.

When i turned it back I ran a full scan through AVG, which I have on my laptop.  The scan picked up no infections.  I then downloaded Ad Awarr through Lavasoft; but this took a long time to upload and update.  Once the upload had finished my laptop automatically shut down and restarted; but then kept crashing.  I tried to turn it on several times but it kept crashing.

I have managed to turn on my laptop today and it has not crashed.  Can you help me?

[GR@PH;<'S]

Cazgogo,
please follow all instructions provided in the sequence given. 
Do not install / re-install any programs or run any fixes or scanners that you have not been instructed to use,
As This may cause conflicts with the tools being used in the cleanup process.   

If you have questions regarding any of the instructions or problems running any tools, please let us know.

Please advise the results of the on-line scan conducted. 
Then, should you still need additional help, please post the requested logs from Log Posting Instructions as a reply.

GR@PH;<'S   :Hammys pint: