Before you do anything, check your temperatures and make sure everything is installed right.
I recommend you read forums and find out what people with a similar build are getting. For instance with a 3570k and a Z77 you might start at 1.25V @ 4.5ghz and see if it boots to windows. If it boots, check temperatures. If temperatures are good, run prime 95 for a couple minutes (keeping a close eye on temps).
If it doesn't crash, up the multiplier. If it does crash, up the voltage. If it starts getting hotter than you want, lower both the voltage and clock until it gets to where you are comfortable with it.
Crashes/reboots are common ground when overclocking. For that reason, it is important to have a system designed to overclock with proper cooling. Most name brand overclocking capable boards have dual bios etc for good reason.