what i think is that ur copy is a corrupted one...
try to download it frm its official site rather than someplace else..
just googled it and found a lot of references of ppl having found malwares in flashget installations...
http://ithelp.indstate.edu/virus/malware-apps.html
http://www.bleepingcomputer.com/star...ager-8436.html
here is the link to remove flashget...
http://www.scanspyware.net/info/FlashGet.htm
so to be on the safer side ,
try out this ....
http://www.freedownloadmanager.org/
its a wonderfull alternative to flashget,nd i have been using it for a very long time... before this i was using DAP,u can try that also.