[Ewok]

I Have 2 operating systems on my computer. one with windows vista home primium factory installed and 1 with windows vista ultimate wich I installed by my self I also have a system restore partition. It's al on 1 hard disk and on different partitions ofcourse.
When I took 50 gigs from home primium and gave it to ultimate a few days ago my computer started to ramdomly crash. And now I get the bootmenu were I can choose for ultimate and home primium but home primium doesn't boot and gives me a black screen and ultimate sometimes boots slowly or gives me an error. Sometimes I even get disk read error instead of the bootmenu. I can see the screen were I can acces the bios menu and stuff.
I tried bootrepair from the installation disk with ultimate and after that it boots some faster I think or it did nothing. Now even the repair from the install disk gets stuck when it searches for windows instalations. and now it isn't even booting the install disk. wich has noting to do with the hard drives. sometimes Home primium boots just fine but thats verry randam and rare.
I don't want to do a full system restore if thats possible. Can sombudy help me
If you need to know something just ask me.
sorry for my bad english i'm duth.