Added new RAM that made computer slow, removed it and it's still slow

I have Windows 7 32-bit and a Kingston DDR2 SDRAM DDR2-800 400 MHz 2GB RAM module.

The motherboard has two RAM slots so I added a new 2GB RAM module. This one was Kingston as well, and if I remember correctly it had the same speed. I don't have details of it right now but it was supposed to be compatible with the first module (actually, the OS recognized 4GB of RAM, as expected).

What happens: after tuing the computer on, it stays 10-20 seconds without showing anything on the screen, until it finally shows the BIOS image and starts loading the OS. Apart from that, it is much slower than before, being quite notorius in games.

I obviously took out the module, but the mentioned problems persist. I don't care about those extra gigabytes of RAM and why they don't work (unlike other questions similar to this one), I just want to get back the previous speed.

I tried resetting the BIOS to its default configuration (Load Setup Defaults option) but nothing changed. I'm thinking about reinstalling Windows.

So my question is: now that I removed the extra module, how do I get back the speed (computer speed in general) I had before adding that module? Would formatting and reinstalling Windows accomplish this?

- - , .
.

Recent Questions...