YT8A.exe

[CBMatt]

If you're concerned about those files, then try uploading them to VirusTotal.  Head over to the site and in the little browse box, search for one of the files and scan it.  When the scan has completed, do the same for the other file.  Do they come up as infected?  If so, post the results here.  If not, then you probably don't have to worry about it.

[Latagore]

  I don't think those files are there anymore. I'm quite confused. Not that I could look for them if they were. I went to system32, couldn't find them. I tried uploading from the directory (c:\windows\system32\japanesename.exe) but it said it wasn't found.

By now, you must have probably learned to skip the first part. Basically, it's gone, or it only comes up when I'm running certain programs.

[CBMatt]

Hmm, do you know which programs use these files?  You can try using Process Explorer to see what it's tied to (only when the file is actually in use).

Also, can you translate the filenames?  If not, then perhaps you can post a screenshot of the file in Task Manager and I'll see what I can do.

[Latagore]

Er, I don't particularly check my processes that often, so I doubt I would catch the process while it's in operation. I guess I'll keep that in mind for later, because it's probably not that big of a problem.

Translating the file names... It's essentially like English viruses. Don't quite make sense, and not like I could translate them anyways. Thank you very much for your help, and I hope that there won't be any more problems.

[CBMatt]

Well, at this point, the only thing I can suggest is to run regular scans with various anti-virus programs.  Perhaps give Sophos Antirootkit a try as well.  If these different programs don't pick anything up, then there's a fairly good chance of that the files aren't malicious.