Hi, two things to try.
1. If you have the Win7 cd/dvd, go here and read:
But I'm thinking that you have a few bad sectors in the HD's boot area (educed from your tzak.tzak description - which is head seek (bang) trying to find the boot sectors). Which I'm not sure that Win7 recovery can cope with. But check out this link and read/follow links:
And this link (better?):
2. Go here and get SystemRescueCd:
It contains many tools for the repair of malfed systems.
You will want to use this tool: TestDisk
Popular disk recovery software. Recovers lost partitions and repairs unbootable systems by repairing boot sectors. It can also be used to recover deleted files from FAT, NTFS and ext2 filesystems. File system recovery is supported for reiserfs, ntfs, fat32, ext2/3 and many others.
In closing, I would get a new HD, maybe a SSD? to replace your original hard drive (It may be failing, or it took a hard knock while in the boot phase, causing head-bang in the boot sector - not good). Make the new drive your master and use the old one for misc. data that you have originals of, i.e. music cd's, dvd movies, programs off-loaded from Tivo/DVR, etc.
Hope this at least gets you going in the right direction...