So I got a new computer last month, but haven't had time to reinstall Linux on it.

Installed Kubuntu this morning off a flash drive, but after the install it simply boots into Windows again. I reinstalled it a few times, even onto another harddisk, but in no fashion can I get it to find Grub. Each of the attempts were successfully installed.

Disk layout:
/sda
1 Linux partition
2 NTFS

/sdb
1 Win7 boot partition
2 Windows7
3 Linux partition
4 NTFS

I have tried this:
Install Linux to /sdb3
Install Grub to /sdb and /sdb1
and
Install Linux to /sda1 and Grub to /sda

In both cases I opted to boot from both drives but it still pops up at the Windows loader.

Any ideas? I can't remember ever having this issue.