Did you find the original filename by right-clicking on the file and checking its properties in the version tab?
There isn't much info on that file but this appears to be it's installation path.
"C:\Documents and Settings\Administrator\Application Data\Real\Update\UpgradeHelper\RealPlayer\8.01\rnupgagent.exe" "/Install"
You may want to contact RealPlayer Support
and ask them what the file is for.
Until its identified, you can at least check to ensure its not malicious. Anytime you come across a suspicious file or you want a second opinion, submit it to one of the following online services that analyzes suspicious files:
In the "File to upload & scan
" box, browse to the location of the suspicious file and submit (upload) it for scanning/analysis.