was deleted from my brothers computer for no apparent reason. he doesnt delete anything, and the day before it was deleted I ran a malwarebytes test and it found nothing, im ruling out a virus got to it.
how can i reinstall this, or better yet wipe his HD of JUST the OS and reinstall with windows 7? right now he has running Windows XP. it will boot to the desktop, it will load his background then a popup window will appear and say something to the effect of "explorer.exe is not present. please reinstall". i would rather not have him use my laptop much longer for the sake of keeping that fairly safe from his horrible browsing habits. if only the OS can be wiped, but all his photos and videos can be saved without backing them up to another drive (i have the room on mine if it needs to be done) I would like to go that route.
thoughts on how i could go about reinstalling Explorer.exe or wiping just his OS and starting fresh with windows 7?
run -> cmd -> sfc /scannow
Microsoft(R) Windows XP Windows File Checker Version 5.1
(C) 1999-2000 Microsoft Corp. All rights reserved
Scans all protected system files and replaces incorrect versions with correct Microsoft versions.
SFC [/SCANNOW] [/SCANONCE] [/SCANBOOT] [/REVERT] [/PURGECACHE] [/CACHESIZE=x]
/SCANNOW Scans all protected system files immediately.
/SCANONCE Scans all protected system files once at the next boot.
/SCANBOOT Scans all protected system files at every boot.
/REVERT Return scan to default setting.
/PURGECACHE Purges the file cache.
/CACHESIZE=x Sets the file cache size.
If you don't have a XP install disk, copy explorer.exe from another machine...