Anti virus (AVG - free version) says that boot sector on C cannot be read. Still, 
I am able to boot my computer, load Windows, the browser (IE 6) works fine, but Window 
Explorer often freezes the computer. 
Scandisk also doesn't work well running under Win (although it runs in DOS) and defrag 
claims that the "drive contents keep changing" altho I'm running it in Safe Mode, 
with nothing else running. 
How can I fix this boot sector (reading) error without damaging the content of the 
hard drive ? Thanks. 

2 years ago, JmC suggested to someone else with a similar problem: 
Restart your computer using a Win98 boot disk, select option 2 on the Startup 
menu and then press ENTER.

At the A:\> prompt, type: SYS C: (note the 1 space) and press ENTER. 
The following files will then be copied to the drive:

*  IO.SYS
*  MSDOS.SYS
*  COMMAND.COM

If the procedure is successful, a 'System transferred' message will appear. If 
it is not successful, check to be sure you are typing the correct drive letter for 
your Host Drive.

Remove the boot disk and restart your system.

I tried this, but it didn't help - the AVG still claims there are errors in the MBR.

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