Protect your PC from malicious websites.

Of course you already know that you must protect your computer from viruses, spyware etc. So you must have good antivirus/antispyware/firewall software. If you are using the worst browser ever, - Internet Explorer - then you are pushing your luck... That's why I suggest you use Mozilla Firefox with AdBlock Plus and NoScript add-ons. AdBlock Plus will block all bandwidth-consuming banners (= faster surfing) and NoScript will block malicious scripts and annoying pop-ups. Don't forget to clear all cookies (and if you want all personal data) when you logout from a PTC site.

Do not use the same password in every PTC site you join
Some scammers are starting new PTC sites because they want to "steal" your personal sensitive information. If you do not want to see your accounts hacked do not use the same password in every PTC site you join. No need to mention that in your alerpay/paypal/email accounts passwords must be unique too. Example of a strong password: Wsaxc3!f$aD (use lowercase, uppercase, numbers and symbols, although most ptc sites do not accept symbols). A good suggestion is to use and 2-4 different usernames too. Finally if you join the forum of a site, it is recommended to you use a different email account (and of course a unique password). Forums are being hacked usually easier in comparison with the main site.
Some sites may ask you to set a 4-digit pin, in order to protect your account from hackers. Alertpay asks too for a 4-digit (transaction) pin. Alertpay pin must be unique, for obvious reasons.