Im getting emails from my sister, that she has never sent me, It has a message like, 'this is a website you might enjoy it', but also send me a picture (gif) of want my sister has already sent me a few days ago?
This isnt just happening to me, but quite a few people I know, but the message and picture is always different.
If all the messages are of the same format but are not exactly the same then it is very likly it is a virus. If they are all the same (and even the dates match) then either their or your mail server/settings are damaged/incorrect.
Msg#: 3522 posted 12:56 pm on Oct 24, 2002 (gmt 0)
Definitely a virus. I get at least 25 of these a day. Often with the same text. Norton anti-Virus hits on everyone of them.
It probably did not come from your sister. Have her check her Sent Items box. If it is there then she might have a virus. More than likely it is not there, and it is pulling a random address from your contacts list, and placing it in the from field.
You might want to visit the Symantec web site, and see if they have a freebie, downloadable clean-up for this virus. Read the description for the klez virus as well, you may have that one.
One thing about these next-generation worms is that they fake the sender address to make them hard to track down. In the old days, the infected machine's owner's e-mail address would be in the message. Not anymore! And now they look around on the hard drive, finding documents from which to extract reasonable-sounding "subject" lines as well.
Symantec used to have a whole bunch of free virus detectors and fixers on-line. They probably still do. You have to dig for them, but they're free. [Disclaimer - I'm not affiliated]