Just recently I was on MSN and out of nowhere my screen just turns all blue and I get these messages that I can't quite remember what it said but all I remember is at the end it said: Dumping Physical Memory.
So I restart my computer and mostly everything is gone, like now everytime I restart my computer and I want to go on MSN I have to create a new .NET Passport. And all my Log-In information on the internet is gone.
Also, I had rosters for Madden 2005 and NBA Live 2004 and everytime I restart the games are still there but all the rosters and everything else is gone.
Basically everytime I restart my computer now its like my Windows XP just starts fom scratch (I don't know too much about computers so I tried to make this is clear as possible, sorry

I know this may not sound like a huge problem but let me finish.
So my first thought was that I had a virus, so I performed a Full System Scan with Norton Antivirus 2003 and I got nothing, so I got tired of Norton since it always comes up with nothing when ever something is wrong.
So I did a little bit of research to find a really good Antivirus program and I ended up downloading a 30-Day Trial of Panda Titanium Antivirus. And as it turns out, I performed another scan and I ended up having infected memory (Which was not disinfected) and over 130 infected files (Which were all disinfected).
So after the scan I restarted my computer to see if anything changed and nothing, it stayed the same with a lot of my information gone.
So I checked the report and I found a lot of "Connection Attempts" in the Virus report. And another thing, when I performed a scan with Ad-Aware 6.0 I checked the report and it found a couple of "Browser Hijackings".
So I'm guessing someone is hacking into my computer through the internet and specifically some files in C:/Windows/System32.
If anyone can give me any advice on anything I can do I would really appreciate it. Thanks.