This is likely caused by hardware malfunctioning or bad driver.
Try to look in the Device Manager for the CD/DVD-ROM and see if it
malfunctioning or a Bad RAM, also USB storage.
You may have a bad RAM try to test your RAM by running Memtest by
downloading this tool and unzip it and make a floppy or CD/DVD and run it on
Reboot.
http://www.memtest86.com/
You may need to reposition/reset the RAM sticks in their slots.
Scan your computer fro malware and Viruses by whatever software you have.
Stop 0x00000050 in Win32k.sys When Changing Keyboard Layout
http://support.microsoft.com/kb/252371
Damaged Font Causes STOP 0x00000050 Error Message in the Win32k.sys File in
Windows 2000
http://support.microsoft.com/kb/319965
The HaxDoor virus may cause a "STOP 0x00000050" or "STOP 0x0000008e" error
message
http://support.microsoft.com/kb/903251
Error Message: STOP 0x00000050 (0xffffffe0, 0x00000001, 0xf30da010,
0x00000000) PAGE_FAULT_IN_NONPAGED_AREA
http://support.microsoft.com/kb/817197
Easy CD Creator 5.0 does not function in Windows XP
http://support.microsoft.com/kb/310628
Use the command chkdsk /r with recovery console:
http://support.microsoft.com/kb/314058
http://support.microsoft.com/kb/326215
DMA Mode for ATA/ATAPI Devices in Windows XP
http://www.microsoft.com/whdc/device/storage/IDE-DMA.mspx
How to enable 48-bit Logical Block Addressing support for ATAPI disk drives
in Windows XP
http://support.microsoft.com/kb/303013
Example on the error code:
http://support.microsoft.com/kb/174232
To get more info about the Error in Event Viewer please double click the
Error message(X) to get a pop-up window contain info about the causer and you
can copy and paste this content in your next message.
HTH.
nass