Every freaking time i want to start my pc...?

Bad move. You don't need Hiren's BootCD if your Windows 8 loads and allows you to access your Windows 7 partition. All you need to do is use the 'Sticky Keys' method to remove the password for a certain user account on Windows 7.

http://4sysops.com/archives/three-ways-to-reset-a-...

You simply need to open File Explorer on Windows 8 and go to the Windows 7 partition. Under Windows\System32 folder find and rename SETHC.EXE or the SETHC to something like SETHC-Copy or anything you like. Find CMD from the same folder and click on it once. Press Ctrl C and then Ctrl V to create a duplicate copy. Rename the copied file named cmd - Copy to SETHC. Restart the computer and boot to Windows 7. From the Windows 7 log in screen tap the Shift key at least 5 times to display the Administrator Command Prompt (CMD). At the Command Prompt window type:

net user loginid *

The loginid is the user account's name that is locked. No need to supply a new password. Just press Enter key twice to erase the current password. Done, the password to that account is gone!

Now having said all of the above and since you've already removed or ruined your Windows 8 OS then your option is to go back to using Hiren's BootCD. However, I have a feeling that you didn't transfer the contents of the ISO to the CD properly that's why it isn't booting and instead goes back to booting from your hard drive. If you got the Hiren's BootCD zipped file from this site,

http://www.hirensbootcd.org/download/

the zipped file contains a small program called Burn2CD when you extract all the zipped file's contents to a temporary folder. Run that to make a bootable disc. You may also right click on the ISO when you are in Windows 7 or 8 and then select 'Open with Windows Disc Image Burner' instead of using the Burn2CD program if you like.

Now as far as using the Hiren's BootCD to remove/change a Windows password, read this:

http://www.hirensbootcd.org/resetting-windows-pass...

Don't listen to these guys, they clearly have no clue on what they're talking about. I am a developer at Microsoft so I know a thing or two about computers. The only way to reset your windows password 100% safe is to use a software called Reset Password Pro.

The software allows you to create a boot-disk, that can be made on a CD/DVD or USB stick. The boot-disk can then be inserted into any locked machine, and it's a simple case of pressing reset. Here is their official site: http://www.resetwindowspass.com/

Hehehehe It also held with me and you need to reinstall it otherwise it will not run