Danielle,
I was curious, so I googled it, here's what I found, from Yahoo Answers:
"W32/Sdbot-NI is a worm which attempts to spread to remote network shares. It also contains backdoor Trojan functionality, allowing unauthorised remote access to the infected computer via IRC channels while running in the background as a service process.
W32/Sdbot-NI copies itself to the Windows system folder as SVDHOST.EXE and creates the following entries in the registry to run itself on system startup:
HKLM\Software\Microsoft\Windows\Curren...
Microsoft Com Port Manager = svdhost.exe
HKLM\Software\Microsoft\Windows\Curren...
Microsoft Com Port Manager = svdhost.exe
W32/Sdbot-NI spreads to network shares with weak passwords as a result of the backdoor Trojan element receiving the appropriate command from a remote user."
Doesn't sound too good!
There's more information at the link below, as well as removal instructions, but BE CAREFUL if you try to remove it yourself. You have to go into the registries and you can really mess things up there, believe me, I've done it!!
http://answers.yahoo.com/question/in...3160812AA7HCRr