Download the AntiMalwerbytes and do a complet scan after he find the virus clear them and restart your computer if dont work do a scan whit AntiMalwerbytes in a safe mode .
Diana, In order to analyze your issue the AVG experts will probably need you to provide them with GMER (http://kb.avg.com/articles/en_US/How_to/GMER-Scan-Result/) and AVG scan result export (http://kb.avg.com/articles/en_US/How_to/AVG-scan-result-export/).
Download the AntiMalwerbytes and do a complet scan after he find the virus clear them and restart your computer if dont work do a scan whit AntiMalwerbytes in a safe mode .
Diana, In order to analyze your issue the AVG experts will probably need you to provide them with GMER (http://kb.avg.com/articles/en_US/How_to/GMER-Scan-Result/) and AVG scan result export (http://kb.avg.com/articles/en_US/How_to/AVG-scan-result-export/).