unexpected increase in hard drive usage

[jg]

I noticed an increase in used hard drive space from 5G to
over 9G overnight...any thoughts on where this additional
usage might be coming from?

 

[Rich Barry]

Check for Virus, spyware, trojans and adware. You can use these sites. The
last two are especially effective.
http://housecall.trendmicro.com/

http://safespy.net/Spyware_Hunter.htm

http://www.lavasoft.de/software/adaware/

http://www.safer-networking.org/index.php?lang=en&page=knowledgebase/threats

http://spybot-spyware.com/trojan.htm

http://www.kephyr.com/spywarescanner/

http://www.spysweeper.com/