I inserted an usb drive into my laptop windows 7 and scanned it.while opening the drive many files are not visible.
and folders were displayed as shortcuts.
after that i could see that below 2 urls are invoked at regular intervals and blocked by avast
hxtp://nnh42.name/a/
hxtp://jsh37.net/a/
Also i could see a lot of windows update icon in system tray
I am not able to install Malwarebyte and cannot run adwcleaner
OK lets now try a different tack as something is blocking OTL
When you download this programme rename it to Gotcha please
Download and Install Combofix
Download ComboFix from one of the following locations: Link 1 Link 2
VERY IMPORTANT !!! Save ComboFix.exe to your Desktop
IMPORTANT - Disable your AntiVirus and AntiSpyware applications, usually via a right click on the System Tray icon. They may otherwise interfere with our tools. If you have difficulty properly disabling your protective programs, refer to this link here
[*]Double click on ComboFix.exe & follow the prompts.
[*]Accept the disclaimer and allow to update if it asks