You're going to get conflicting information here, so you will need to do some research on your own and come to your own conclusion. The short story is that in computers that have the Advanced Configuration and Power Interface(ACPI), which would include your Window 7 PC, using the power switch is not very likely to have any ill effect. Such was not the case in earlier PCs and Windows versions, especially pre-XP DOS-based versions. There are two reasons that there is a pause before shutdown when you press the power switch. One is to prevent inadvertently shutting down the PC by hitting the switch accidentally, and the other is to allow Windows to suspend read/write operations prior to shutdown.
I would follow ThrashZone's advice and solve the problem of Windows not shutting down normally, then you won't have to worry about it at all.