Use a Proxy
This method has been used for ages and it still works just as well as ever. If all you need to do is bypass the web filter on windows vista then a proxy is definitely the way to go. Simply do a search on Google for proxy sites (and believe me you can find thousands) and once you find one thats not blocked just use it to browse the web without restriction.
Boot from a live Linux CD/DVD/USB removable drive
You can find tons of free live Linux CD's which allow you to run a Linux OS straight off a CD, DVD, or USB without installing anything to your computer. Obviously if your running an entirely different OS which leaves no trace on your computer after you remove the CD/DVD/USB you don't have to worry about Internet filters or being tracked. If you're not familiar with how to use Linux then I suggest checking out "Zorin OS" which is a free Linux distribution that looks and feels just like windows. You can download it at http://zorin-os.com.
Hack The Password
Ultimately the best way around parental controls is to just completely disable them. But to do this you'll need the administrator password. Fortunately hacking the password on windows Vista is a fairly simple process.
Step 1: Go to ophcrack.sourceforge.net select Vista and download the ISO. After the download is complete burn the ISO to a CD.
Step 2: Restart your computer (with the CD in) and your computer should now boot from the live CD into a Linux environment.
Step 3: Ophcrack will automatically run as soon as the CD boots and now all you need to do is wait until Ophcrack has completely finished cracking the computer password(s). This process will take anywhere from 10 minutes to several hours depending on the strength of the password used to protect the computer.
screen shotStep 4: Finally now that you know the computer password; reboot the computer, eject the CD and enter in the password.
That's it! Now you'll have complete access to everything on the computer and you can go ahead and remove parental controls or do whatever you'd like.
Remote Control Another Computer
This option is great because it allows you to do pretty much anything you want and if your parent walks in the room all you have do is minimize your browser and you'll be ok. There is one major drawback though, this method requires that you have a non-parental controlled computer connected to the Internet at all times. So pretty much the only way to make this work is to either find a friend who doesn't mind you taking control over their computer whenever you need, or buy a cheap pc from a garage sale and then hide it somewhere your parents wont find (which is also fairly difficult because, remember, you have to have it running and connected to the web at all times). But if you are successful at finding a PC you can use then what you need to do is install some remote control software on that pc; I suggest either using the free software from Logmein.com or from NTRconnect.com. Both LogMeIn.com and NTRconnect.com allow you to access the pc you install it on from any web enabled computer.
The previous suggestions were just a few ways to beat Windows Vista parental controls but if any one knows of other ways to get around Windows Vista parental controls make sure to leave a comment describing how, and I will add it to this post. Note: please don't leave suggestions like how to trick your parents into giving you a password or ideas like reformatting the hard -drive and reinstalling. I only want suggestions that would work for anyone and that don't risk damaging or destroying data.