problems after installing SP 1

Hey guys I use Windows 7 (dahh)
Now... I use the same Windows since 4th of july 2010.
After I installed SP1 my date and time showed the exact time I installed the Windows and everytime I restart it goes back to the same time, also it gives me some trouble before windows is loading (somthing with BIOS).
Will a system restore solve this thing out?

I'm almost sure it won't. Let me guess: your BIOS is complaining that some checksum verification failed and all the settings are being reset to default. Then Windows boots.

Am I right?

It sounds like the CMOS battery (which also powers the hardware clock) in your computer is dead. It's easy enough to replace, it should be of type CR2032 which costs just a few bucks.