repeated bsods with rest periods

As well as I remember, the first one said that I was trying to use something too old to run on my system. After that things were fine for a few days, then it occurred again for no apparent reason. Repetitions have been occurring more and more frequently during all different sorts of applications, sometimes with no application running ... . The bsod message (which goes by faster than I can read it before restart begins) is different each time . This morning the system crashed again as soon as I brought up Firefox. I restarted in safe mode with networking and it crashed again. I restarted in normal Windows mode and it has stayed up for four hours without any problem. This is the usual scenario. sigh. Any suggestions will be greatly appreciated. Muchas gracias, granny v

Ah,muchas gracias. Okay, if it will stay up that long. Crashed this a.m. with System_Service_Exception; then again with Interrupt_Exception_Not_Handled so ran Startup Repair and it returned everything 0x0 to: Uknown Bugcheck 3d. Parameters = 0xfffff800b9bcc0, 0x0, 0x0, 0xfffff880058be400 Repair Actiion: System Restore Result cancelled. Repair action: System files integrity check and repair Result: Failed. Error code: 0x490
I have all startup items disabled (have had for a long time), Norton Antivirus. Ran Norton Eraser a few days ago & removed one old file. I have been trying to update drivers from Dell but so far have only gotten the RealTek HD sound done. Will start right away on this list. Again, many thanks. granny v

Well, this has been interesting (and time-consuming). Should I have told you that, after the initial two or three crashes, it comes up and runs just fine? ... until I shut it down. It shuts down fine. When I bring it up the next day, at least two crashes. I have performed almost all the steps you outlined: 1.I have no start up programs & no programs in my start menu, that has always been true, whenever I install something new, I check mscnfg to be sure it did not sneak in there. 2.Ran TDSSKILLER and it found 0 threats (I use Norton Internet Security, so didn't really expect to find any) 3.I have not done the clean startup, but that is next. 4.Ran SFC/VERIFYONLY and it reported "Windows Resource Protection did not find any integrity violations" 5.Ran CHKDSK and it reported only that some empty sectors were marked as allocated & would fix that. 6.I really do not feel the need to change my security software, Norton seems pretty good. 7.Ran CrystalDiskInfo (only a portion of the results are visible on my screen so I will upload a file extracted with the copy command) 7.Still working on SPECCY. My husband has made the interesting suggestion that I simply not shut old Stewie down at all as the problem seems only to occur at bootup. sigh. still wondering, granny v

Umm, a week ago Friday, it crashed hard during a bsod. Unhooked everything & packed it off to the computer man. So he called to say that he had it up & it had been running fine for a day. I asked him to shut it down & (cold) boot it in the morning. Next day he called to say it had blue-screened, just as I had told him it might. After running diagnostics & such, he said that there were two failing components; the graphics card & the power source (which I had rather suspected). Since the computer is almost 5 years old, I told him to zip it up & I would fetch it. At the suggestion of my husband the electrical engineer, after hooking everything up again, I plugged it in but did not turn on the machine until after 20 minutes ... let a trickle charge build & warm the power source?? It booted up very well! Per same person's second suggestion, I have not turned it off since. It continues to run very well. Occasionally, I get some severe, intermittent pixilation across part of the screen. Otherwise it has not blue-screened since. (Oh, did you know that "pixilation" means "affected by pixies"?) As long as we don't have a power outage, I will keep it cooking until either the graphics card or the power source gives up altogether. Many thanks for your assistance!