To understand your options, start with this special web page from Microsoft. Also check out this question and answer page. Understand this, Microsoft wants you to buy Windows 8 to replace XP. If you have an older computer, it probably won't work. That may mean a new PC.
If you decided to keep XP and your old computer, sites like the Tech Support Guy can help, free. Run by volunteers, this site lets you ask questions and get help. There's a whole area devoted just to Windows XP issues.
Now, what about protection from hackers and viruses? Microsoft will provide virus protection for XP through it's free security essentials program for one more year. Private antivirus companies like AVG and Kasperksy Lab will continue providing virus and malware protection for Windows XP machines.
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