That blue screen that you see flashing by may be important. It is called the Blue Screen of Death, (BSOD), and will display when a fatal error is encountered. (The term "Fatal error" does not necessarily mean what it implies). The BSOD can hold important messages relating to what caused the error, and any STOP error codes.
When a computer does display a BSOD the only recourse is to make a manual note of the message, then turn the computer off using the switch on the case, but seeing what that message says is important.
Windows is normally set to "restart" on a system failure, and that's why you don't see the message, but you can prevent that. When you are next booted into Safe Mode, find your "My Computer" icon on the Desktop display or in the Start menu, and right click it. Then select Properties.
In the System Properties window, click the Advanced tab, then under "Startup and Recovery", click the "Settings" button. In the new window, remove the tick under System Failure where it says "Automatically restart". Click OK/Apply/OK.
Now you can reboot, and if the system halts with a BSOD, make a note of the message, including the STOP error code, and report back here.
Other things I would do.
1] Disconnect all USB devices before booting up, (except your mouse and keyboard if they are USB).
2] Try another anti-malware tool called MalwareBytes Anti-Malware, (MBAM). It is a free utility. If you cannot download and/or install it on your laptop, download the file and the manual update on another computer, and copy it to a CD and transfer it to this one. Full instructions are in Marianna's post here;
If you can run a full scan with that in Safe Mode, that would help.
Let us know how you get on.
I got a lot of information from the internet, what finally got the virus was Avast. I then loaded my purchased kasperskey & restarted the computer. Everytime it starts it goes through the start up but then I see a quick flash of blue then the safe start up mode comes up. The laptop will only start in safe mode. I remember avast asking me about files in the windows\system32.. I said to delete them. Could I have deleted something that is causing the computer to not boot up? What do I do about this? The only other thing I remember that may or may not be an issue is I was prompted to install hardware. I thought this maybe another virus so I declined & restarted my computer. The only hardware I used was a usb drive that I'd used before on the computer. I used the usb drive to upload the avast software to the laptop. I have tried to remove the Kaspersky protection but I can't. Unfortunaely I purchased this laptop from someone a few years back & dont have any of the restore disk. The laptop is running windows xp professional with sp2 installed (registered copy). The laptop is a Dell lattitude D600. I am in no way computer savvy so if there is something else I should list please let me know.
Thanks in advance