welcome to the forum.

i think there is no problem with your english.

i suggest you do a boot scan with avast. and if avast finds any threats during the scan get avast the order to send them to the chest.

http://www.schmahl.net/avastbootscan.php - link to instruction how to make a boot scan.

second download, install, scan with malwarebyte antimalware, don’t forget to update its database before you do a scan.

http://filehippo.com/download_malwarebytes_anti_malware/ - link to malwarebytes.

if you still having problem after this two scans, i suggest you do a scan with hijack this and post the result here.

http://filehippo.com/download_hijackthis/- link to hijack this.

good luck and let us know on the progress or if you need more support.