Rnaapp interupts scandisk and defrag

Make sure there is nothing running while defragging. When you Ctrl Alt Del, close everything except Explorer as this is all windows needs to keep running.

If that fails, download Ad-aware from http://www.lavasoft.nu/index.html
This will find any other programs that may be running in the background, make sure you get the reference file updater. You should use this anyway, so get it even if something else sorts your defragging out.

rnaapp runs when you use a telephony program. Once you close a dial-up connection rnaap can stay active in memory for up to 15 minutes. In your case it sounds like some program may be trying to connect to the internet or is waiting for a connection to be initiated.

Many different ways to do this, and earlier answer mentioned shutting everything down but Explorer, systray also so has to run or as you shut it down you will notice your system shuts down also.
To avoid this problem in 98 the quickest way to do this is in safe mode which does not start all the extra programs and dedicates more resouces to the job at hand.

You should check your email program and Internet Explorer Options to see if either is set to connect/ check for mail at regular intervals. Uncheck these options.

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