Windows Startup Error

[Guest]

My computer seems to go into a loop at startup. I loads until the XP logo
appears and then after a few seconds restarts and begins to loop. I cannot
load safe mode or any other type of mode. I tried disabeling Automatic
restart on system error and computer stops at XP logo, and instead of
restarting, a blue screen shows up saying:

Stop: c000021 {Bad Image Checksum}
The image user32.dll is possibly corrupt. The header checksum does not
match the computed checksum.

I researched the error online, but there solution does not work, because
when I use a boot disk, I can not find my hard drive(c. I have used a
windows 98 se, windows me, and windows xp msdos boot disks and I still cannot
acces hardrive (states that it is an invalid drive specification). My three
cdroms are loaded perfectly, just no acces to hardrive.

My computer went down yesterday (April 12, 2005) night. Upon shuting
down, the computer automatically installed a security update. I went to
sleep and next morning computer would not start, going into the loop
mentioned earlier.

Please help fix my computer...

Pavel Galchenko

 

[Rich Barry]

Pavel, you could try accessing the drive thru the Recovery Console.
Check here
http://support.microsoft.com/kb/314058

Or, you can try a Repair Install
http://www.michaelstevenstech.com/XPrepairinstall.htm