I think someone has accessed several of my accounts (email, fb, etc) and don't know what to do?

[Jess]

Well it all started with tumblr - a few days ago I saw that I had been logged out of my account on my laptop, which is odd because I never log out of tumblr, and I'm the only person that has access to my laptop, which has a password and I keep it in a safe at home. I tried to log in, and it said my email or password was incorrect. So I tried again, checking carefully to make sure I spelled everything correctly. After a few unsuccessful attempts to log in, I clicked on password help, and when I typed in my email address, it said that it wasn't registered on tumblr. I logged into that e-mail account (a hotmail account) and saw that all my emails were gone. All of them, my tumblr emails, emails i had sent, and other emails i had received. I changed my password, and contacted tumblr. My tumblr blog was still up at the time. I gave the tumblr support staff my URL, and told them which email address I had used to sign up. They said that they sent an email with the details about why my account was inactive to the email they had registered for the account. I haven't received any emails, so I am assuming someone has gone on my account and changed the contact email address and password.
Also, every time I check my login history on yahoo, someone has logged in from a different country. Usually somewhere like the Netherlands or Austria or Germany, or sometimes in the US. Also, all my facebook ads are in German. I have never been to Germany, and i don't speak German - and my facebook ads only change when I log in from a different country. I don't know anybody in Germany or Austria or the Netherlands, and besides, I am a teenage girl, and I don't have any important information stored in my email accounts, like credit card/bank information or anything like that, so why would anyone want to access my accounts? It's really pissing me off and it keeps happening even when I change my password. I don't know what I should do - any suggestions?

[Mark]

The best option for you is to use a Linux CD/DVD instead of what you are using right now. On the contrary of relying on your hard drive, your optical drive will force any hacker to stop their endeavors. Imagine an operating system were you reboot your computer, and everything is as "good as new."