Help! Cannot remove TI Secure Zone...

Hi,

I have been helping my dad try to speed up his old XP computer. I have uninstalled a bunch of software he doesn't use (he really only uses Word & Powerpoint), and I uninstalled Acronis True Image Home. The computer was still booting and at the BIOS screen saying press F11 to boot using the Acronis Recovery Manager. I then noticed in the XP Disk Management screen that there was still this separate partition, so I deleted it, and it is currently unallocated. Now when I reboot I get an error message about the Recovery Manager, but luckily Windows still boots after that.

What do I do to fix this mess?!

Regards,

Laurie