I installed QTP 10 on a 2003 server 64 bit.
Upon reboot I get an error that a driver or service failed to start.
In the Windows event log I see:

Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7000
Date: 1/15/2010
Time: 12:07:37 PM
User: N/A
The paldrv service failed to start due to the following error:
The system cannot find the file specified.

Thanks all