HP Pavillion multi-boot problem

Hello, this my first time on seven fourms and the reason why I signed up is because I have windows 7 home premium x64 bit which has a problem. I installed windows xp professional x64 bit and when I rebooted, I got a black screen with a blinking cursor in the upper left hand corner. I read online that its better than a plain black screen but I did not find any answers. Later, I installed linux zorin 5.2 x64 bit and I could see that my files are still there but I can't use windows 7. I realized the reason it takes forever to boot is because there is a boot menu but I can't see it because my monitor says "input signal out of range change settings to 1600x900 60Hz". I noticed I can select operating systems but windows 7 isn't one of them. Today, I just installed ubuntu 12.04 x32 bit and the boot menu still didn't come up. I need help to get windows 7 back. Please help immediatly.

Thanks for the help, but I don't have the restore disk. I think we got it at the store already preloaded onto there. But at the end of the invisible list, I can enter the restore thing. By the way, I had followed the instructions to install another opperating system, create partition install. But it still didn't work. So I'm stuck with linux.

Clear the decks? I don't know what that means. Delete the partition?

OK thanks, I will figure out a way. Maybe I will reinstall Ubuntu because I can't do anything with a Linux kind if command prompt.

I really don't know, I read online that there is this program called easy bcd but I don't have an internet connection. This whole time I was using a samsung replenish phone to do this thing.