Macbook Pro 17inch Snow Leopard
3.06 ghz intel processor 4 Gb ram

My mac is doing the most random things that are oddly annoying and I'm worried that something is wrong.

The other day I restarted my computer and the background changed itself to the original purple one and changed my clock to decemeber, 31st, 2000 and set the time back one hour.

Then today I went to go on facebook and it to me to the spanish version and I've never used that one once. My battery meter also showed 0% and it never said it was running on reserve power or anything.

I don't know if these little things result to anything. But they sure are odd.
I've also checked my disks in disk utility and everything came out okay, nothing needed repaired.