MBR error 3

Hi guys, after 2 of my custom built gaming computer, I have been having occasional problems stating up. I push my power button and SOMETIMES (less then half'ish) I get my regular splash screen. Without seeing the splash screen, I cant even use the F keys to access stat up options. Even when I do use the repair disk to repair it, the repair screen has a little bar with command prompt, I click to expand it and it just dissapears after about 3 seconds so I cant enter any of the fixmbr commands. I tried starting it in safe mode but the commands dont seem to work their either. After it scans for errors, it wants me to use a recovery point, I tried this once and it didnt work, it just has the same MBR error.
Either way, with the splash screen or not, I still get the mbr error 3 just bellow the "Vallidating DMI Pool Data"

When I dont get the splash screen, after the error, there is a long pause, about 2 mins or so, and it says, "system recovery options" and is just frozen there.

I'm planning on getting a new hard drive tomorrow.

Well, Change of subject: I have purchased a new HDD, reformated the old one, and installed windows 7 on the new one, works fine! not the end of the story, me being me, i decided I would try installing ubuntu! tada! problem -.- i guess i installed ubuntu on the new hard drive over the windows 7, i THINK im not sure. When i try to start, it fails and crashes and retries to start again.
When i try to use the F8, repair mode, it goes to the repair screen, and is frozen, the keyboard doesnt work.
When i try to boot from the cd, i get this weird screen that wants me to select my language and some other stuff, and install it, but the same problem, its frozen again.

So, the good news!
I do have Ubuntu running on my computer. Other than that I have no idea what to do.
Please help!!!