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NMI: Parity Check / Memory Parity Error
pray to god you never get this message, because if you do you might spend a great deal of time learning things you don’t want to learn 
guessing things you thought you’d never guess and possibly come out without any results at the end.
to keep long story short. I spent about 3 days on and off playing with this computer. It was a sony vaio s460 – the one I fixed last week. we brought it back to the customer and she called saying it was getting blue screen of death all over again!
This parity check error is very confusing. if you go searching google or even microsoft site you will find direct suggestions that its your memory problem.
And even though that’s where I started, it was not the case for me. I ran some RAM tests with couple of software programs, Ubuntu live cd 9.0 has one which is free to use and takes a while it. I did it and the test was complete without errors. the system had two RAM chips. so I took one out and tried with running pc with the remaining one. and I still got the same blue screen. I then switched to the second chip only and still I would get the blue screen.
this was frustrating. it seemed it would require a lot of testing.
second day I thought perhaps its windows xp problem, so I installed windows 7 on it just to give it a shot. At first it seemed like a good idea, because windows 7 gave me the windows recovery error on boot up and it said it was sound card related. However after I updated the driver it still gave me memory parity error.
On other websites I also found this error can be due to bad power supply or any of the hardware components may be failing.
for this computer it was an external wireless PC card Netgear wg511t – I can actually put it in now and get parity error message in about 5 minutes so do your testing before you jump to any conclusions. blue screens of death are weird. you almost never know what is happening. It requires trying and figuring it out, unless of course you have advanced diagnostic tools.
for all computer questions call overnight pc repair in woodland hills, ca at 877-938-8777 or visit online at www.overnightpcrepair.com
So this Sony Vaio VGN-S460 laptop is nice and neat and still holding some solid power with 1GB of RAM and 160GB of HDD. which for a little older laptop is still pretty nice. Running on windows XP professional it is still promising long years of operation.
The two problems it had were related to wireless adapters in the computer. There were two and both of them were not connecting to any wireless router giving limited access error or not connecting at all.
First adapter was obviously internal Atheros adapter with an updated driver. Second was an external wireless PC card made by Netgear with model WG511T ( I am not sure where you get these if you wanted one nowadays 
my first thought was to reinstall both drivers and see what happens. I did. but nothing happened. I could see there is a conflict with the drivers, however they simply wouldn’t listen. So I proposed the next best thing. to back up the data and do the windows reinstall for system. (it was time to do it anyway) computer has been running on it for over 3 years or longer.
couple hours later after I was done, computer was running a bit faster, both wireless adapters were working and connecting especially WG511t. it was getting signal much better and transmitting data faster than internal wireless card.
so here you are. no problem is too big or too small here. We either fix it or we die. as simple as that. www.overnightpcrepair.com is most acute problem solving computer repair shop in los angeles and chicago! call us at 877-938-8777 for free diagnostic and free flat rate quote over the phone now!