download a free firewall like zonealarm and avg antivirus, avast or some other free antivirus, then download spybot and adaware you can also download spyware guard and spyware blaster, last download Winpatrol.
Now you have to set their options right and run them, that is use them, you also have to set the security, privacy and the advanced right on Internet Explorer.
Last change your user name and password for your ISP and Email, here on the forum change your password, set all the options right for your pc, internet explorer and the above programs, if you need more protection than that use an encrypted anonymous proxy server connection to surf the net thru with.
All of this might be a little too much for you, but you can learn a little at a time. Download those programs, install them and go from there.
The most important ones are the firewall (ZoneAlarm Freeware) and The AntiVirus (AVG antiVirus Freeware or some other good one).
Then get Spybot Search and Destroy and then ADAware, those are the only ones that you really need.
The others are just for extra-protection just in case you really ned it:
Spyware Guard, Spyware Blaster and Win Patrol, all the programs I told to you about have freeware versions, get those, if you want to pay you can get the Zone Alarm Pro version, it's a little better than their freeware version, I just use the freeware stuff myself.
As for an encryted proxy server anonymous connection that is only for the very most really extreme cases, in case that nothing else works out O.K.
Also change your user-name, IP adress and passwords, and all email addresses and passwords and also the Lottery Post password, only if you really really have to then also change your Lottery Post user name, but that is an extreme measure, changing your password should be enough.
Also as I said before changing all your Internet Explorer settings to make it more secure is a very good idea.
Go to tools above then internet options then security then fix those settings, then go to privacy and fix those and last go to advanced and fix those, that all as said above should do it.
I have learned a few things on my own, nobody taught me.
When you are paranoid about security like me, you learn, but it takes a while.
Use only Internet Explorer and no other browser, it's the most secure of them all, also get all your Microsoft Security Updates for your PC and browser.
Good luck.