Aylin,
when i try to use the windows help from the start menu,a
message pops up "cannot open the file:%systemroot%
\help\windows.chm."what is the problem?
Here are some things to try:
1) Use MJ's Help Diagnostics to check that all the components used to
display HTML Help files are properly installed and registered.
http://helpware.net/downloads/index.htm#MJs
(The only section of the MJ's Help Report that is relevant to your
problem is the one headed "HTML Help Run-time Components".)
2) Use Microsoft Critical Update 811630 to upgrade the HTML Help
viewer components. This is available from here:
http://support.microsoft.com/?kbid=811630
3) Delete or rename the file hh.dat, which you should find in this
directory:
\Documents and Settings\%username%\Application Data\Microsoft\HTML
Help
The hh.dat file stores user-specific information on all the HTML Help
files on your system (favourite topics, search history, etc.), and can
cause the files to misbehave if it has somehow been corrupted. Windows
will create a new version of hh.dat when you next open any .chm file.
4) Empty your Temporary Internet Files directory. A full TIF directory
can cause HTML Help files to misbehave.
