OEM Office 2010 crash, missing file, hope to fix

Hi,
First, thank you to the forum and contributors namely Brink for helps, tips to Win 7.

I am trying to fix OEM Genuine MS Office Starter 2010
running on Win 7 x64 on Asus N55S i5-2430M since 2011

It crashes and won't allow use bcos specific file missing.

Last wk, Panda failed and notebk was infected, explorer crash.
I fix the infection/virus but lost some SYS, registry files.
Since then, I tried w/o success:
- Control Panel/Prog & feature/ Uninstall Repair = Repair
- restore Win 7 image,
- factory restore OS

Appreciate help.

Hi Irene,
I read your post and link. I shall attempt sfc /scannow
FYI, this is OEM version of OS and there is no installation DVD.

BTW, I am considering a new free antivirus over Panda Security
since Panda free failed when they launch paid version.

I read aavast! free tops the list followed by AVG,
I appreciate all suggestions on free antivirus.

Will revert on the result of sfc /scannow

Irene said:

Have you tried doing a system file check:
SFC /SCANNOW Command - System File Checker

I ran sfc /scannow offline 4 times and restart each time. The final result is
"Verification 100% complete.
Windows Resource Protection found corrupt files but was unable to fix some of th
em."

The missing file was discovered when Microsoft Office was being deployed.
MS Office did not provide file names.

FYI, I ran sfc /scannow a few more times and still no improvement.
I notice when I defrag a few times, there is an additional run of Relocation each time.
Appreciate on Microsoft Security Essentials. :)