Bear in mind that the computer is almost certainly infected, and it is essential to correct that. Sanitize with the free version of MalwareBytes Anti-Malware. PC Magazine with WestCoast Labs concluded that this is the best program for clearing already infected systems, superior to even the best antivirus products. Before scanning, insert any flash drive.
http://www.bleepingcomputer.com/download/malwarebytes-anti-malware/
When all malware has been removed, open My Computer and note the USB drive letter.
Open Notepad, then copy & paste these lines.
ATTRIB -S -H -R *.*
DEL KPCGRHYNKO.VBS
MD MOVEVBS
MOVE *.VBS MOVEVBS
DEL AUTORUN.INF
MD AUTORUN.INF
ATTRIB +H +R AUTORUN.INF
Click File and Save As. Type "C:\MOVEVBS.BAT" (including the quotes) as the file name, then click Save.
Power down the computer. Power up and immediately begin tapping the F8 or F5 key to invoke the advanced options menu. Select "Safe Mode with Command Prompt".
Log on to any account with administrator's rights. When the command prompt opens, type the USB drive letter followed by a colon, then press Enter. To verify that you're on the correct drive, type
DIR /A /W
and press Enter to list the drive's contents.
If you're satisfied that you're looking at the right drive, type
C:\MOVEVBS.BAT
and press Enter..
Remove the flash drive. Insert another drive and perform the above command. Repeat for each flash drive.
When done, type SHUTDOWN -R -T 0 (the last character is a zero) and press Enter to restart.
[ What the commands do —
The first ATTRIB changes all the hidden, system, and read-only files to ordinary files.
The DELs delete the kpcgrhynko.vbs and autorun.inf files.
The MD and MOVE commands referencing MOVEVBS create a folder by that name, and move any remaining VBS files into it.
The MD creates a FOLDER named autorun.inf, which prevents the creation of a malicious autorun.inf FILE, and ATTRIB makes it hidden and read-only.
SHUTDOWN restarts the computer. ]