The word capital, in politics/geography, refers to the town or city that is the official center of a country's government:

Washington D.C. is the capital of the U.S.

The word capitol is very specific - it refers to a building or complex of buildings where the government meets to make laws.

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The capitol building in the U.S.

London is the capital of England.

In economics, the word capital refers to wealth (money and/or property) belonging to a person or company. A business that is just beginning needs start-up capital (an amount of money to get started).

We also have capital letters (ABC) - the big letters that are different from lowercase letters (abc).

Capital and capitol are pronounced the same.

Precaution while using WiFi

Consider Encryption

There are several open source software that can encrypt your files as well as entire hard disks. I suggest TrueCrypt, a free software that encrypts your entire hard drive so that none can access it without breaking your password. So if you are using encryption, use a good one, create a good password and do NOT forget the password else it will be trouble decrypting. Bitlocker comes with Windows 7 and provides encryption to each of your hard drives and partitions. You may set up BitLocker to decrypt the drives automatically or using a key. Here is an article explaining Bitlocker In Windows 7.