How can i bypass CHKDISK at startup when my PC does not boot into windows ?

If chkdsk keeps running after each reboot - then you have serious data corruption - or failed sectors on your hard drive.
I would recommend booting from a windows cd into Recovery Console (hit R at the first blue screen - after booting from the cd) - then run chkdsk /R
This will run a full chkdsk - and will scan for and mark bad sectors - hopefully so that windows will not use them again. This should also stop the chkdsk running at every boot - unless there is imminent hard drive failure - have you got SMART enabled? Do you get any warnings?

On boot you get a moment that you can skip the checkdisk for that time, do that and continue to windows. Then try this:

Disabling Chkdsk - Windows 2000 and XP
1. Run the Registry Editor (regedt32.exe)
2. Under the HKEY_LOCAL_MACHINE subtree, go to the following subkey:
\SYSTEM\CurrentControlSet\Control\Session Manager
3. Change the BootExecute entry to:
autocheck autochk *
Exit your registry, you may need to restart or log out of Windows for the change to take effect.

get your hard drive diagnostic tool and run it to find out the problems with the hard drive
http://www.tacktech.com/display.cfm?ttid=287

"right now im not able to start up windows at all"

Could you please confirm whether you can get into Windows?

Hi bluecirlce
1. Start PC in Safe mode - press F8 at boot time.
2. Run the Registry Editor (regedt32.exe)
3. Under the HKEY_LOCAL_MACHINE subtree, go to the following subkey: \SYSTEM\CurrentControlSet\Control\Session Manager
4. Change the BootExecute entry to: autocheck autochk *

I can get as far as the windows xp loadup up screen then check disk appears and the same situation happens again it freezes up at stage 3. I have pressed f8 and tried to boot from safe mode (it freezes up when it trys to load up the drivers) and i tried to boot up form last know config that worked still nothing. i have also put in the windows xp cd and tried to do a restore. still freezes up. I have also put the hard disk (SATA) into another PC and tried to load up another XP and read that HD but, once i plug in the HD it still requires me to do a chk dsk.  i have also disabled the chkdsk through the reg edit but still not luck. it still wants to do the chk dsk.

Sounds like a failed/failing hard drive. Get it replaced.

This is a work HD so there is valuable Data and Reports that i need to recover from the Hard drive before i decided to get it replaced. i have no been able to load it up on another PC as it wont pass the CHKDSK stage if i could jsut get it to load up and back up all data i will be fine. But atm i cant do anything with it.

On any boot disk include Ultimate or Hiren,  You have boot tools form HDD vendors to check Disk. if it hardware error, it will find it.
If it show it hardware problem - You'll need to replace HDD, but if not - possibly some logic problem.

If you need the data back - and it is very important - and bearing in mind that multiple chkdsk's have not completed properly - there is going to be significant data corruption - then I would use Ontrack's lab recovery service:
http://www.ontrackdatarecovery.com/data-recovery-service-options/

Thanks for the help everyone,
i booted the HD using the ultimatebootcd, but the HD was completly corrupted so. in this case nothing could be done