Your USB stick is infected
Download MCShield to your desktop and install
It will initially run a scan and show the result as a toaster by the system clock
Then in the control centre select scanner and tick unhide items on flash drives
https://dl.dropbox.com/u/73555776/mcshield%20unhide.JPG
Plug in the drive and McShield will start a scan
Then get the log which will be located under the logs tab on the main page
And post that
THEN
CAUTION : This fix is only valid for this specific machine, using it on another may break your computer
Open notepad and copy/paste the text in the quotebox below into it:
CreateRestorePoint:
HKU\S-1-5-21-1184248209-71312194-2478159784-1002\...\CurrentVersion\Windows: [Load] C:\ProgramData\msoifer.exe <===== ATTENTION
HKU\S-1-5-21-1184248209-71312194-2478159784-1002-{ED1FC765-E35E-4C3D-BF15-2C2B11260CE4}-0\...\CurrentVersion\Windows: [Load] C:\ProgramData\msoifer.exe <===== ATTENTION
BHO-x32: No Name -> {0E8A89AD-95D7-40EB-8D9D-083EF7066A01} -> No File
2015-07-17 16:39 - 2015-06-15 22:16 - 77493120 ___SH () C:\ProgramData\msoifer.exe
C:\Users\Raúl\appnimi-pdf-unlocker.dat
Reg: reg delete HKLM\SOFTWARE\Policies\Microsoft\Windows\IPSec\Policy\Local /f
Reg: reg add HKLM\SOFTWARE\Policies\Microsoft\Windows\IPSec\Policy\Local /f
RemoveProxy:
EmptyTemp:
CMD: bitsadmin /reset /allusers
Save this as fixlist.txt, in the same location as FRST.exe
https://dl.dropboxusercontent.com/u/73555776/FRSTfix.JPG
Run FRST and press Fix
On completion a log will be generated please post that