Sounds like you're infected.Check out the thread below for a couple of different fixes.
2 probs (LW keeps restarting & can't access options)

Also try the fix that worked for sirios in the thread below.
Starts on its own/ options folder won't open (possible fix)

If nothing helps, go to one of the malware removal sites listed in the first thread

There are heaps of infected files on the network. Always make sure that you're using a good antivirus program. Keep it updated & use it to scan every file that you download, before opening the file.
WARNING: Viruses on network you should be aware of!