Limewire didn´t install this .dat file. And it would really help if you would tell us the name of the .dat file. Do you have a virus scanner and a firewall?

http://free.grisoft.com/*******.php/doc/1/

http://www.zonelabs.com/store/conten...eeDownload.jsp

To get rid of your spyware use ad-aware:

http://www.download.com/Ad-Aware-SE-...bj=dl&tag=top5

Morgwen