help! ive got a virus!

ammonite

ive definitely got some sort of a virus on this laptop, i keep getting weird error messages. it is a definite virus, but not sure what to do. ive got avg on here which obviously isnt brilliant but can someone tell me which programmes to run to check and delete the virus? someone helped me a while back with a virus on my other laptop but cant find the thread.
thanks in advance xx

closed

full scan with malwarebytes (update it first) fix anything found, uninstall avg, install avast.

aliEnRIK

Download MALWAREBYTES (Make sure you click 'DOWNLOAD LATEST VERSION')
http://www.filehippo.com/download_malwarebytes_anti_malware/
Open malwarebytes and goto UPDATE and click 'check for updates'. After its updated goto SCANNER and click PERFORM QUICK SCAN then click SCAN
Remove everything thats found (needs to be ticked)
Post the COMPLETE log here AFTER youve deleted everything it finds
If anything was found then do the exact same but run a FULL scan


reboot

Download HIJACK THIS (Make sure you click 'DOWNLOAD LATEST VERSION')
http://www.filehippo.com/download_hijackthis/
Click MAIN MENU then DO A SYSTEM SCAN AND SAVE A LOGFILE(Takes seconds) then post the log so we can see whats running
(do NOT do anything else with Hijack but scan and post the FULL log)
If you get a message that you cant write to the hosts file then Press the SHIFT key, and whilst holding it RIGHT CLICK and select RUN AS (admin)