Nail.exe actually comes from a company called direct revenue. It is a kind of adware/trojan.
download, install, and update the free version of Ewido security Suite
http://www.ewido.net/
download CCleaner and scrub ur pc for junkdo not run it yet.
http://www.ccleaner.com/
download this installer for the Nailfix utility revised
http://www.noidea.us/easyfile/file.p...50711214630636
with the help of ccleaner, remove nail.exe, if it appears in the startup list.
now reboot into safe mode. and run the above utilities.
for further details click
http://netrn.net/spywareblog/archive...urora-nailexe/
http://www.spywarewarrior.com/viewtopic.php?t=14580