Once again to all who are getting a virus as
"Win95:Matyas"
or
"PAV.sig"
or
"imscan.dll"
These are not viruses. They are unencrypted Panda Virus scan files. If you have ever installed any Panda antivirus including running an online free scan from Panda website, these files are generated and saved on your PC. Avast detects them as a virus because they are not encrypted. They are false-positive and you can ignore them. Set Avast to ignore/exclude them next time you run the complete scan. If you no longer needs the files (if you installed Avast, you should no longer need them) dlete them.