Q: Updates do not insatll

Hello,

Which exact updates, & what happens exactly, step by step?

If you really are at 10.5.2 then get the big combo directly & Install, but first...

"Try Disk Utility

1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.

2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)

*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*

3. Click the First Aid tab.

4. Select your Mac OS X volume.

5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."

http://docs.info.apple.com/article.html?artnum=106214

Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.

(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)

If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

Then get & apply the Combo Update, 10.5.8...

http://support.apple.com/downloads/Mac_OS_X_10_5_8_Combo_Update

Repair Permissions afterwords, reboot.

Have you followed the advice at the following link?

http://support.apple.com/kb/HT1338