Welcome to BleepingComputer
What we need... We need a explanation of what is going on with your computer. That means: error messages and codes (Verbatim if possible), beep codes (Does your computer give long or short beeps during start up. If so, in what pattern), flashing lights on your computer or keyboard... etc...
If you are getting a message from a program/antivirus/antispyware give us those.
Did something appear on your desktop that you didn't place there - like an icon??
If you have changed your computer by adding or removing hardware or software, let us know that.
Paint us a picture of your problem.
ex.. "I am getting error messages on startup saying program XYZ.exe did not load. I ran my computers antivirus package and it said I was infected with the quietman trojan. The problem reoccurs even after quarantining the files. I then get an orange screen and my computer freezes"
Then, follow that with a general makeup of your computer... "I am running Windows XP on a HP Evo 5100sff. I have 1GB of memory installed."
Since you have posted here, I m assuming that you have malware problems. You may wish to follow our Start Here
post. That will get you started with step by step instructions.