My PC give me that error each time when I turn it on,"This application has failed to start because Trident.dll was not found. Re-installing the application may fix this problem." Please help me to solve this problem.I have this problem more then one year.
I use Windows XP, AMD sempron(tm) processor.Please write your answer with details,because I'm not very good about computer.Thanks

Time to scan your system for viruses/spyware as the referenced file is used by malware:

Here's my usual C&P for cases like this:


When was the last time you did some serious maintenance on your system ?

System maintenance includes:
Defrag
FULL patching
Virus scanning
Spyware scanning
removal of rubish files

Defrag is an inbuilt function in XP.
Open My Computer > Right click C: > Tools Tab and its there.

To make sure everything is running fine run both anti virus and anti spyware apps in normal AND safe modes. (make sure that they are updated first ! ;)) (AVG (http://free.grisoft.com/doc/1) is good and free AV)
(A couple of good removal tools are Spybot (http://www.safer-networking.org/) and Adaware (http://www.lavasoftusa.com/software/adaware/))

ALso an on line virus and spyware scanner is Trend Housecall (http://housecall.trendmicro.com/)

Just a note: actively running two AV's on one machine can cause problems.
So if you are thinking about it make sure your current one is disabled first.
Same thing applies to online scanners as well.

Removal of junk files is easy with CCleaner (http://www.ccleaner.com) a free app that does exactly what

If all this fails then a repair install may be in order:

Here's (http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/tips/doug92.mspx) the official Micro$oft way of doing it,
and Here's (http://www.geekstogo.com/forum/index.php?showtopic=138) one with screen shots.

Basically this installs windows over the top of your current setup.
So you don't loose any information you already have.

This lot should resolve your issue.

I think your system is infected with some trojan virus. Are you using any Antivirus programmes. Have you ever run an Antispyware in your system? You should first try to scan you computer with the AV as well as the Antispyware programmes to find out the infection.

May I ask which application is causing this error?

There's three possibilites that may be a resultant:

- If you have any damaged components of Sygate Software (Firewall Software)
- If you have any damaged components of Trident Microsystems
- Malicious software has either damaged the DLL or has made fake error messages.

If this is the case, try un-installing and re-installing the software.
Please let me know. Be sure to run a full Virus scan in Safe Mode (F8 at the boot screen)

Good Luck!