Hey guys,
I left my computer running overnight while it downloaded some movies through MegaManager. When I got up this morning, the computer was in a state of constant restarts. It would get to the desktop, the blue screen would flash for about a split second and then it would restart again.

I turned the computer off, left it for a while & turned it back on. It's running ok now, has been on for about half an hour. But I've lost the Windows XP theme (it's currently running Windows Classic) and whenever I try to open gmail, I get a security error page in Chrome that doesn't give me the option to proceed to my email despite the warning. However, in Firefox I get no such error.

Does anyone know what's up? I know how to get back the XP theme, but it all just seems rather odd.

Oh & the details;
I'm on Windows XP with service pack 3. Running both Chrome & Firefox, with Chrome as my main browser (both updated regularly). I'm an intermediate user and so far my trouble shooting as gone as far as googling to see if anyone else has had the same issue.

Thanks in advance for any help.