If you continue to get this error message it may mean something has corrupted or damaged a file(s) or is interfering with a security tool component file:

http://www.liutilities.com/products/...ibrary/iamapp/

iamapp.exe is a process loaded by Symantec Internet Security suite and is essential for the smooth running of the firewall and anti-virus software. This program is important for the stable and secure running of your computer and should not be terminated.

See if you can do the following:
Go into SAFE MODE (gently tapping the F8 key while rebooting) and run CHKDSK.

Procedure:

http://www.linkgrinder.com/tutorials...s_article.html
QUOTE
For Windows 2000 and XP, double-click My Computer. Right-click the C-drive and click Properties. Click on the Tools tab and choose to check the computer for problems. Click on Check Now. You will then have two check boxes. The top option is for the file check, and the second option is for the hardware (physical disk) check. Check either one, or both. At least check the top one. Again, if you think you may be having problems with the hard disk itself, then check the second one, as well. And just like the Windows 98 Thorough Scan, this will take quite a bit longer to run, so let it run over night. One thing, though: For Windows 2000 and XP, you won’t be able to run the check right then. After clicking the Start button (once the check boxes are checked), you will need to reboot to run the disk check. It will ask you if you want the system to run the CHKDSK on reboot. Choose Yes and reboot. Just before getting back into Windows, the system will do its CHKDSK, and depending on which options you chose, will take either a few minutes, and sometimes up to an hour or so, to run. Let it run.



It may be necessary to run CHKDSK more than once if problems are found. The first pass may only repair or restore bad sectors. The next scan might need to delete (orphaned?) file or index entries.