hey someone will check thoose logs and give you further instruction. but a little more information would be good so we could help you better.
what os you using?
what avast version you running?
i suggest do a scan with malwarebytes antimalware as a first opion
and a boot scan with avast would hurt.
http://www.filehippo.com/download_malwarebytes_anti_malware/
download install update and do a scan and don’t forget to remove what it finds. plus a system reboot might be necessary.
instruction how to do a boot scan you find here:
http://www.schmahl.net/avastbootscan.php
good luck and lets us know on the progress.