Ok, first of all, you need to know what software is installed in C:\PROGRAM FILES\CXTPLS\, is that something you, or someone in your family installed, or it just appeared. If it appeared after installing some game or something like that, it is very possible it's some kind of spyware, and you can safely delete the damn thing. Try manualy deleting the file CXTPLS.DLL, from Windows commander, or Command prompt, not Windows Explorer. If you get an error saying you can't delete it, press CTRL+ALT+DEL, and look for CXTPLS.DLL in Processes tab, in Task Manager. If you find it, terminate the process, and try to delete that DLL again. If it again fails, than some other program is using it. If however, you can't find it running, it means some program is using it. Now, I can't precisely tell you what to look for, because I go on a hunch, and just guess what should be running and what shouldn't... If this is the case, I suggest waiting for your dad's friend, to look what's wrong.
I don't know how much experience you have in editing registry, but if you do it as much as I do, try looking trough:
1. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
2. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
3. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
4. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
5. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnceEx
and delete any occurence of CTXPLS.DLL, or anything suspicious...
But, BE VERY CAUTIOUS! You can easily disable some of the applications, and in turn, maybe Windows itself. If you are unsure of anything I mentioned, don't do it, or drop me an email, and I'll guide you trough it, or wait for your father's friend...
That's about it...
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