VISTA users:

The original version of Microsoft Vista did not ship with a driver that is required
to view the help file in SYNOPSYS.  This capability is provided in
SP1, and you can download the required driver from here.

There are two files that you can download;:

Windows6.0-KB917607-x86.msu

and

Windows6.0-KB917607-x64.msu.

Use the first unless you have a 64-bit version of Vista.

Save this file to your hard drive, and double-click it.  The driver will install automatically.