No one in the XP forum..is an "expert" at determining whether a file is valid or is malware...but a user can usually look at the stated file size and the location of the file...and then make a guess.
For expert opinions on possible malware items...we have our malware forums....where people trained to deal with malware go through various procedures to determine whether a system has a malware problem...and how to respond to such, if it exists.
If a file relates to a program which you know is installed...and it's in the seemingly proper place...chances are it's not a malware item (that's how I approach it, innocent until proven guilty).
Many files "could be a trojan" since malware has no qualms about usurping a filename or making a filename that is close to a valid file. Again, file location and size are the only two factors (outside of a description of the file, where it belongs, and what might have installed it) that I know that a person can use.
Users tend to forget...no one who is viewing your post...has access to your system, no one can check these things quicker than the original poster.
If I see a file that is both "unnecessary" and "could be a trojan"...I try to remember that I don't like unnecessary items using system resources and my system defenses have never let me down in ridding my system of malware items that could disrupt system functioning.
I tend to prefer Google to any startup listing...because I get more opinions and the information is more current, IMO...than any listing/database which may be maintained by one website on the Internet.
<<...and the fan comes on quite a bit when I am playing games and other things.>>
That is by design, the fan is there to relieve some of the stress brought on by heat when the system is working harder than normal. I don't game, but my opinion is that gaming is the most stressful thing a user can do to aystem, outside of overclocking. I would expect the fans to work overtime under either of those situations.
System manufacturer and model? How much RAM is installed? How much free space on the C: partition?