Win XP virus/black screen/can't use computer: Please help!

My system crashed after antivrus died in macafee and windows; think that there was an automatic update, that sort of USB mass device had been loaded (not by me). Initially, managed to get in line for 1 min max and I saw that Macafee caught a Trojan horse think in April. Tried to update to macafee but only got 78% then crashed. Now can't access the internet at all. When I nowtry to run in safe mode, system stops to... partition\windows\system32\drivers\Mup.sys. When I try to load normally, see "Windows XP" logo then black screen. Have a Dell Dimension 9150 and have run diagnosis: no problem, all is past. I tried partition magic and got code 1516. Tried chkdsk/f, but no joy. Help, please!

In this situation, I would try to remove the malware as a cause of the problem.

Start the computer in safe mode with network and download and install Malwarebytes (free version for individuals only), updated definitions and run in safe mode. Disable other security software while you do the analyses.

http://www.Malwarebytes.org/

Download and run SuperAntiSpyware (Free Edition)

http://www.SUPERAntiSpyware.com/download.html

Some malware is installing the entries of proxy server redirecting internet connections. If you encounter this problem step 2 see in the following link:

http://www.myantispyware.com/2011/02/21/how-to-remove-Internet-Security-Essentials-virus/

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