can't install critical patch

Hi,

I found a critical patch which is missing in more than 20 PC and shows PCs as Highly Vulnerable.

When I tried to install the patch I got an error message "%1 is not a valid win32 application" on all of the PCs. I tried again and got the same error!!

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patch details:
PatchID : 1208
PatchName : office2003-kb887979-SP1-enu.exe
BulletinID : MS05-023
MS KnowledgeBase : 887979
Severity : Important
Reboot : NotRequired
Download Status : Downloaded [ 3521.37 KB]
Location Path : office2003-kb887979-SP1-enu.exe
Superceding Bulletin ID : NA
CVEID : CAN-2004-0963
BugTraq ID : 13122

Affected Products Affected Service Packs
Word 2003 Gold
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why I'm getting this error??

Best Regards,

oalamani