Problem overclocking my XPS 630?

Here's my system specs.

Q6600 @ 2.4 ghz

Duel 8800GT's in SLI

4gb of RAM @ 667.

I get into the control panel thing,

I did this..

675MHz core
1625Mhz shader
980MHz memory

and set the cooling for both cards to 50%.

It all worked good, looked at the system monitor and it showed that it all went through.

I went to overclock my Q6600 next, and set it so it'd be at 2.6 ghz (was going to slowly put it up) and set the fans to 46% for that.

It worked good, so then I restarted my PC..

and all of the settings are undone and went back to default.

What did I do wrong?

Thanks.