Crappy virus thingy...

[ukdane]

Actually Slips,
That's handy to know.
I just opened the file, and found:
127.0.0.1 localhost

and the IP for our wireless connection to the printer.

As the member of the family/street/workplace etc etc that people always come to when they have a problem, it's always handy to have a little more ammunition in thy backpocket.

[Buddy]

So if there is anything else there apart from localhost that I didn't put there do I just delete it and save the file??

[Slippery PD]

If you want to be really careful do a save as of the original and call it oldhosts.  Then make the changes and save as hosts, so you have a copy of the file should it all go wrong.  

Dane effectively the Hosts file acts like your local DNS server, so if you wanted to call your wireless router a name.  You can add it in here, with its IP address and hey presto you can ping it.  
(You have to do a reboot or you can be really clever and do a nbtstat -R from the command prompt)

Please be aware that this is for competent users and dont change the hosts willy nilly... and always keep a back up as above :ugeek: