XP disk check runs every time I boot

Every time I boot my computer XP checks my backup partition (it is NTFS) for errors, this has become really annoying because my computer is old-ish (5+ years) and I don't leave it on like I used to.

Is there any way I can disable the disk check, or solve the problem?

Try this from the command line (I'm assuming drive C; adjust as appropriate):

chkntfs /x c:

/X  Excludes a drive from the default boot-time check.  Excluded
    drives are not accumulated between command invocations.

Use this to see if a drive needs to be checked or is configured to be checked on next boot:

chkntfs c: