All of sudden I could not get into MSDN documents within Visual
Studio. Everytime it shows me the following message: Cannot find
server, the page cannot be displayed. I could not recall what I did to
my Visual Studio, so I inserted the MSDN disks and trid to repair, but
the problem did not gone. Any idea to solve it?

BTW, I also notice the whole process looks slower than usual. Maybe
the problem is caused by the antivirus software (McAfee in my
computer)?

Thank you in advance.

Here is a sample:
Click Help->Index, and type in "ShowWindow" at "Look for:", then
double click "ShowWindow", get a blank window showing "Cannot find
server, the page cannot be displayed."