*** Stop: 0x0000007e (0xc0000005,0xb64fd141, 0xf78e219c, 0xf78e1e98)

PLEASE HELP!!!!!! i keep getting this screen.

I have a Toshiba A105-S171 which i just upgraded the RAM from 512 to 2G.
just i case anyone needed to know.

There could be various reasons for the said error such as any faulty device or system error, can also be hardware incompatibility, and many more. You should better checkout the Event Viewer and see what the main cause of the problem is.

For your reference, here are few list of error codes and their cause:

• “0x0000007E, 0xC0000005, 0xFC5CCAF3, 0xFC90F8C0, 0xFC90F5C0” Error Message at Startup {KB 321637} Win XP
• 0x0000007e Error When Registering OLEMSG32.DLL or CDO.DLL Files {KB 238265} Win NT, Win 2000
• 0x7E Error Occurs in Kbdclass.sys When You Try to Shut Down Win XP {KB 313050} Win XP Professional
• Error message in Win XP Service Pack 2: “Stop 0x7E” {KB 900485} Win XP SP2 (Timing issue — patch available)
• Stop error 0x7E in PCI.SYS {KB 839641} Win 2000, Win XP, Server 2003
• Stop Error 0x7E in USBHUB.SYS {KB 327863} Win 2000, Win XP, Server 2003 (If USB bandwidth consumption exceeds 100%)
• “STOP 0x0000007E” Error Message After You Upgrade to Windows XP {KB 330182} Win XP
• “Stop 0x0000007E” error message when installing Win XP Disk Image from a Remote Installation Services Server {KB 818966} Win XP
• “Stop 0x0000007E” error message after you upgrade to Win XP Service Pack 2 on a non-Intel-processor computer {KB888372} Win XP SP2
• After installing Win XP SP2 or Win XP Tablet PC Edition 2005, your computer restarts continuously {KB 873161} Win XP SP2, Win XP Tablet 2005 (UMAX scanner issue)
• Problems after you resume Windows Vista from sleep or hibernation {KB 929734} Vista (various device hangs etc. hotfix available — see also KB 925528)
• Occasional Error Message on Portable Vista-based Computer That Wakes From Sleep to Perform Network-related Tasks: STOP 0x0000007E {KB 930311} Vista (hotfix available)

Hello gracortiz1, did you tried booting the system in safe mode and getting the same error? By the way, is this problem occurring during startup or later?

Anyways, till you reply just check the following article for solution on this error:
How to troubleshoot a "Stop error code 0x0000007E (SYSTEM_THREAD_EXCEPTION_NOT_HANDLED)" error in Windows XP