Taking to long to scan removable media

Hi
I tried to scan a removable media of 4GB but faced some problems. in first steps everything went fine until scan reached an .exe file which had a suspicious name like this
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and scanning stopped here, better to say slowed down. what’s wrong? I know that “AUTOIT” is a virus but I have never had any problems with this virus before.
how can I remove it?
thank.

how can I remove it?
you mean avast! can not remove it ?

Try this

Malwarebytes Anti-Malware 1.46 http://filehippo.com/download_malwarebytes_anti_malware/
always update the program before you scan
click the remove selected button to quarantine anything found
please post the scan log here