I'm suspicious of that as well. Boot into "safe mode" hitting F8 key during boot-up, repeat if that doesn't succeed. Once, in safe mode with "networking option" run from your PC either your AV pgm. and/or other pgms. to seek out malware. Allow it to clean your system. If you have access to another PC d/l needed pgms. check the security, virsus and malware form here and check the "sticky" for links, etc. on what may help. Burn to disc or use flash drive(need networking) and run pgms..
This was the alert on my pc 6/17/11: " SYSTEM HAS DETECTED A PROBLEM WITH ONE OR MORE INSTALLED IDE/SATA HARD DISKS . PLEASE RESTART." It also offered an online fix for $84 which made me think it was a scam but then the pc crashed.
I did try to restart but no avail. I was able to access Juno (my ISP) by going thru my Juno installer but I can't access any other programs.