When I try to boot the computer normally, after the Windows XP logo it goes to the "Blues screen of death" and lists the following techinical information:
"STOP: 0x00000024 (0x001902FE, 0x0F78C63D4, 0xF78C60D0, 0x08AE87805)

If I try to boot in Safe Mode, while it is listing\loading the drivers it stalls at
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS\SYSTEM 32\Drivers\agp440.sys

And it says after about 30 seconds that I can press escape to abort loading SPTD.sys

If I press escape, I can boot into safe mode. If not, it goes to the windows XP logo and then to the blue screen.

I tried to do Safe Mode with Command Prompt and do a system restore, but there were no restore points on the system. This is strange, because I recently cleaned my computer, and I'm pretty sure a restore point was set.

I ran Super Anti-Spyware and it found 11 threats. I removed them, but the problem remains.

Please advise on what I can do to be able to boot my computer normally again, if possible.

Thanks.

I forgot to say that I'm running a Dell 4600 Series with Windows XP Profesional.

Here's a multitude of information on that error;

SPTD.sys - Google Search

sptd - sptd.sys - Program Information

File Information - How to remove sptd.sys error problem

Other, possibly related info/suggested fixes;
Cannot boot in safe-mode SPTD.sys - Guru3D.com Forums

If this provides no solution(s), post back to that effect.

As I cannot access the internet in safe mode, I am unable to run these scans on my actual computer. I have located the sptd.sys file in my drivers folder. Would you advise removing this file? I am running Daemon Tools on my computer, but it is not for a vital reason. Meaning that if deleting the driver only affects Daemon Tools, that is an acceptable sacrifice. Please advise. Thanks.

I would rename the file/extension before deleting it. See if that helps.

I changed the file extension and my computer was then able to boot up normally, however, when it reached the desktop and began loading I received the message that the file "whxk2335.exe" had failed and it asked me if I would like to send an error report. I clicked "Don't Send" and it continued to load, but it wasn't doing anything. In my task manager I could see the PC running at 100% memory usage, with the task "CLI.exe" using the majority of the memory. The computer won't load anymore than this. Suggestions?

Originally Posted by Derucksucks

As I cannot access the internet in safe mode.

You must select safe mode with networking in order to access the internet in safe mode.

Originally Posted by Derucksucks

I changed the file extension and my computer was then able to boot up normally, however, when it reached the desktop and began loading I received the message that the file "whxk2335.exe" had failed and it asked me if I would like to send an error report. I clicked "Don't Send" and it continued to load, but it wasn't doing anything. In my task manager I could see the PC running at 100% memory usage, with the task "CLI.exe" using the majority of the memory. The computer won't load anymore than this. Suggestions?

CLI.exe is a program associated with your graphics drivers & normally I would suggest that you remove and reinstall them however since you had found spyware and have a thread going in the malware section I suggest that you follow through with that until your computer has been declared clean as that is a higher priority and might clear your current ills. Note that you should watch what you do online if an infection is suspected. For example certain things that I wouldn't do would be to log into credit card accounts or back account or any other financial accounts; any accounts that are sensitive in nature I would log into from another computer. As for help over there, you are going to have to wait until one of our security experts is online.