You have downloaded and installed 'malware'
Your computer is now definitely infected.
ALWAYS be sensible about file sizes and be very discriminating in dealing with the results of your searches.
NO legitimate movie - .avi for example - is going to be less than 560 - 700MB.
There is a very secure, quick and easy fix available to you... (Assuming your internet connection is OK !)
To save a lot of typing, please click on the following link
>
http://www.gnutellaforums.com/limewi...rojan-fix.html
This will probably sort out your problem...
btw, No... Nothing to do with Torrents except that within the Gnutella Network there are a lot of commercially inspired creeps pretending to offer Torrents, but the resulting downloads, when opened, install nasty apps that usually 'force' normal users into going to websites to buy special software that will remove the sh¡t that these criminals have put on your computer in the first place.
There may be some delay... I've seen as much as 1 week... before these rogue apps start affecting your machine.
Get rid of it/them NOW.
Real Torrents are a completely different subject and although Limewire now pretends to be able to deal with them it is totally inadequate and only a proper Torrent 'client' should be used.