Go ahead and delete it. keep an eye out for a few days to see if the file comes back .
Think Prevention: Put in place a good hosts file
http://www.mvps.org/winhelp2002/hosts.htm
How To Download and Extract the HOSTS file:
http://www.mvps.org/winhelp2002/hosts2.htm
Repeat that proccess about once or twice a month
PC Safety and Security--What Do I Need?
To help avoid reinfection see "So how did I get infected in the first place?"
http://castlecops.com/postlite7736-.html
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