When run sfc /scannow , it says system3_.exe error

We should back up a bit and get some more information...

Since the Microsoft Answers forum does not prompt for any kind of system information when a new question is asked, we know absolutely nothing about your system.  Not knowing fundamental information about a problem prolongs the frustration and agony of resolving these issues.

Thank you MS Answers, for making the resolution of simple problems as frustrating and time consuming as possible.

Please provide additional information about your system as best you can:

What is your system make and model?

What is your XP Version and Service Pack?

Describe your current antivirus and anti malware situation:  McAfee, Symantec, Norton, Spybot, AVG, Avira!, MSE, Panda, Trend Micro, CA, Defender, ZoneAlarm, PC Tools, Comodo, etc.

Does the afflicted system have a working CD/DVD drive (internal or external)?

Do you have a genuine bootable XP installation CD that is the same Service Pack as your installed Service Pack (this is not the same as any Recovery CDs that came with your system)?

If the system used to work properly, what do you think might have changed since the last time it did work properly?


What is the issue you are having that you think sfc /scannow will correct?

See if the Remote Procedure Call (RPC) Service is running.   If it is not running, it needs to be running and many other things will not work if the RPC Service is not running.

To do that, click Start, Run and in the box enter:

services.msc

Click OK to launch the Services applet.

Locate the Remote Procedure Call (RPC) Service and see what it says in the Status and Startup Type Columns. 

If the RPC Service is not running (it needs to be), right click it, choose Properties and see if you can Start it and change the Startup type to 'Automatic'.  If you make adjustments, click the OK button to save your changes, reboot and make sure the adjustments "stick".