It won't boot up. Error message says the following files are missing or corrupt.
C:\WINDOWS\HIMEM.SYS
C:\WINDOWS\DBLBUFT.SYS
C:\WINDOWS\IFSHLP.SYS

Reinstall your Operating System

I don't think you will need to reinstall the OS, just do a repair install and the missing files should be replaced from the disk itself. I do hope you have your data backed up though, just a recommendation.
Repair Install should be more than likely enough to take care of your problem.

Raj

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