This is the best free, online scan: http://us.trendmicro.com/us/products/personal/free-tools-and-services/index.html
If you don't have an antivirus (that automatically updates) on your laptop, buy one now. I like MacAfee.
If you can't correct this, you may need to reformat your hard drive and reinstall all of your software. Make sure that all of your files are backed up (external hardrive, CD, online, whatever) in case your machine crashes.
at 6:09 AM on May. 15, 2009