It is easy to be paranoid about these matters, but knowing how to recognise a hack attack can be tricky.
Vain hackers who are full of their own self-importance might leave you a note , perhaps a bit of desktop graffiti or a malware timebomb , but those are rare. Most hacks are courtesy of Trojan software and related automated tools, so uncovering an intrusion particularly an online one can prove difficult.
If you suspect a hack, first of all consider why you think this might have happened. Do you have sensitive information stored on your computer? Are you known as someone who might have access to private data? Next, check the files in your directory browser, taking care to note their Last Modified times and dates. Do not open the files, however, as doing so might result in the activation of malware.
Instead, run your anti-virus and anti-malware software, and then make backups of the vital files and folders before opening them.
Or better don't do that because we go for door number 2
by comming to this server and loading this page you are willingly give your pc and/or all your computer cycles to us
so please don't remove that root kit we just installed on your behalf so we can use your computer power