Hello fellow viewers, i have reached a dilema that i can hope somone out there can help me with.  Last night i was playing my computer and i was looking around the internet for some Oblivion mods and this one weird page popped up and it SAID something about a virus protection program thing and to click to download.  Well i did what most people would do (i think) and i clicked no and closed the page.  After awhile i noticed that there was this little icon by the clock and when i put my cursor over the icon it said virus alert, so i clicked it trying to figure out what this "virus" was. When i clicked on it it told me that i had a trojan horse virus and it ran the program that the page that popped up told me about. So i went to add/remove programs in my control panel folder and i promtly deleted this nasty file.
  Well deleting that file didn't get that nasty icon to go away, so i ran my Norton ANti-Virus and i scanned my computer, and then after that i deceided to should use the disk defragmenter to make it run a lil better, because my computer was running alittle slow and after all that was done i booted her down for the night.  THen earlier today i tried to run her and she would get to the part where it said windows xp professional sarting up and would not get past that.  So i restarted her again and she ran windows but it took forever to get started. THen i tried to run Norton again but it wouldn't let me run it or get on the internet, so i shut her down.  Then later on i tired running her again and she wouldn't even start windows but i could get into the computer setup menu thing when u first start the computer.  Oh and one more thing, when i have the power connected to her, she will start up like ever 30- 45 min and get to the same point (right before the black screen with white letters turns to a blue screen with a windows logo if that helps anyone).
  My computer has a 3.46 ghtz Intel Pentium 4 processor (bought it like 2 years ago), 1GB of RAM, a Sapphire ATI Radeon x700 series (haven't had the chance to upgrade yet)   graphics processor, and a kinda big hard drive (can't remeber how much, i could FIND out if that is needed).  Anything else to need to know about my dilemma just post and i will reply whenever i can.  
  What i think it did was CRASH my windows operating program ( I can be wrong, i just was some other opinions on what i can do to fix this problem ), any help is greatly appreciated.  

Start in Safe Mode + Networking, go & get HJT, come back here with the logfile.
Have a read of the following link then look for the flashing green light on the left.
http://www.tomcoyote.org/hjt/Whilst you're in safe mode, install and run the following programs as well (Boot with Network support to download, but RESTART and boot into normal safe mode before scanning)

AVG Free Anti Virus
Adaware SE Anti Spyware



I tried getting into windows safe mode by mashing and holding down the  F8 key but it still gets stusck on the black screen.  It will run all the way to the part (on my computer anyways) where it says: verifying DMI Pool Data.  Usually after that part it used to boot windows xp pro and it would be gravy from there.It doesn't go beyond verifying DMI pool data?

Try resetting your BIOS to its default values.