Cannot log into Windows XP

> Windows XP starts up and presents me with press CTRL-ALT-DEL to log in
>
> Apply valid username and password and observe system loading personal
> settings
>
> Receive the message "Your system has no paging file, or the
> paging file is too small ........." with various instructions about
> increasing the size of the page file etc...
>
> Only problem is that the system then proceeds to log off immediately and
> there is no opportunity to set the page file size
>
> The username and passwords are all OK, result is the same for
> administrator
>
> Booting into command console and running chkdsk on the drive correct some
> errors on the drive
>
> Any suggestions on how to get into the system
>
> Hardware is relatively unimportant as XP has been running in a stable
> manner
> on the same machine for some time now
>
> Thanks to anyone who can help me solve the problem