You can see how to fix Portal 2 crashes here:
The Portal 2 crashes that you'll experience on your PC are basically going to be caused by a number of problems that will prevent your system from actually reading the game. This problem is going to be the result of the likes of a number of issues with your computer's options, preventing Portal 2 from being able to quickly run as smoothly as possible. If you want to fix this issue, we'd like to recommend you fix the problems the game has before then using a tool to repair it for you.
You can see how to fix the Portal 2 problems on your PC by looking at our website. We advise you first re-install Portal 2, and then use a program called a "registry cleaner" to make sure that windows is able to run as quickly & effectively as possible. This will not only make sure that your Pc is able to run correctly, but also that Portal 2 has the capability to operate on your system.
You can see how to fix Portal 2 here:
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PersonalComputerFixes.com is a leading supplier of PC advice & support. You can find out how to fix a number of different errors on your system by using this website.