The same webpage that you downloaded the SysInternals "Rootkit Revealer" from has information about how to use the program, and how to interpret the results. Visit those pages again, they are very clearly written & straightforward.
Quick note before we go to more detail: the only completely sure
way to be absolutely certain a rootkit is no longer present -- is to zero-write your hard drive, flash the bios of your motherboard with a write-protected diskette (to avoid the possibility of a bios infection), and start all over from scratch - reinstalling everything. Any personal data saved to removable media needs to be scanned thoroughly before being restored to the freshly installed system.
If you have Symantec/Norton's "SystemWorks" installed on your system, it installs a rootkit-type process, which would show in the Revealer's log with entries that include the phrase "NTProtect". I have to say that I have yet to see a version of SystemWorks that is worth running, and recommend using other tools. http://www.eweek.com/article2/0,1895,1910077,00.asp
This rootkit is thought to be less troublesome than the Sony one (following paragraph) - but in many techs opinion - no rootkit is a good rootkit. Symantec has since released a patch to undo it's rootkit-type behavior - but it's questionable if the system changes leave trouble behind.
Sony can also install a rootkit as part of a badly considered copy-protection idea. The bad news is that malware authors can co-opt the rootkit for their own use. As you might imagine, there are lawsuits going on.
Rootkit Malware threats -- http://news.com.com/FAQ+Sonys+rootki...3-5946760.html
Background info -- http://en.wikipedia.org/wiki/2005_So...ection_scandal
What can you do?
Detection & Removal -- http://www.pcsupportadvisor.com/rootkits.htm
You will find links to other rootkit detection & removal programs in that last link. But I stand by what I said at the outset -- to be completely sure, you really do have to wipe everything & start over.
Media Player has had several Security patches over the years, and a couple this year. It's cpu usage really shouldn't go over 25% for more than a moment. It's memory usage shouldn't go over 20mb under most situations I can think of. Either your Media Player is serious broken, or seriously compromised - neither of which is wonderful.
If you want to try to salvage the current system, without starting from scratch:
1) If it's only the SystemWorks rootkit that was found, use LiveUpdate & install the update that fixes that.
2) If others are found, use the removal tools mentioned in the "Detection & Removal" link
3) Try the 5-Step Security checklist http://www.techsupportforum.com/showthread.php?t=15968
4) If the system scans clean after that, try a run of the Windows File Protection (aka System File Checker) - - from the Start/Run box, type the command "sfc /scannow" (without the quotes) [you will need either a Windows XP CD, or to point sfc to the spot on your hard drive that holds your Windows .cab files -- often in C:\Windows\Options\Cabs]
5) Then test Media Player after that. If it still proves balky, you can try reverting to version 9 http://ezinearticles.com/?Uninstall-...Again&id=56655
-- or going up to version 11. Or using a different player. But make sure the system is malware-free, above all.
Best of luck
. . . Gary