Yesterday my computer worked perfectly, but tody when I plug my USB stick in, it completely freezes, I mean it can do nothing: I can’t access any drive, or any files or folders, it just loading.
However, when I unplug my USB, it back to normal. MCShield scanned this, and found it:


MCShield ::Anti-Malware Tool:: http://www.mcshield.net/

>>> v 3.0.5.28 / DB: 2015.10.2.1 / Windows 8.1 <<<


12/10/2015 9:53:52 SA > Drive J: - scan started (no label ~15072 MB, NTFS flash drive )...

>>> J:\autorun.inf > Action failed. Access was denied - blocked by your antivirus or active malware!!!


=> Suspicious files  : 0/1 renamed.

____________________________________________

::::: Scan duration: 30sec :::::::::::::::::
____________________________________________

I have this problem before, but after I format my USB stick (as mentioned in my #1), it back normal. A day later, it become infected