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I noticed on one computer running XP SP2 that when I delete SOME exe files (ex:spider.exe,spoolsv.exe) from c:\windows\system32 folder, that they came back ..I thought it is a virus ..so I checked on another computers ..one of them have the same ..Is this normal ?

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What the hell did you do that for?! – Phoshi Nov 21 at 11:20

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Those files are critical parts of Windows XP and it's trying to rescue itself with Windows File Protection (http://en.wikipedia.org/wiki/Windows%5FFile%5FProtection).

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For the well-being of your computer...

Avoid modifying manually the contents of C:\Windows

...unless you are very sure of what you are doing.

If you don't know, assume the files are Windows system files and leave them alone. Google a filename if you aren't sure.

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Spoolsv.exe is (usually) a print spooling service. Spider.exe is part of the emailscraper (?) service. Both are part of Windows XP, and although I've not heard of it could I guess can be regenerated on startup.

If however, the .exe files are something else, then yes, you should be worried.

Why did you delete them anyway? Did you have evidence of their being dubious?

Sources: (File.net: spider.exe) (file.net: spoolsv.exe). These give other info like file sizes to help check authenticity.

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Yeah, its normal! If you want to delete a file from system 32, use unlocker app to do so! You can use an antivirus software to find out if a program is a virus or not, then use the delete feature in the antivirus software!

And dont make deductions for a virus based on your instincts! Usually viruses would be a hidden file!! If you find a suspicious file search for it on the net! and use some online scanners! Yeah its time consuming, but its worth it!

Good luck!

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