5/6/7/8/9/200 Series Trouble Shooting Guide for Drivers
Great Failsafe way when your Installing/Updating your video drivers
This works with XP/Vista 32/64bit operating systems
Ok first thing is go to Guru3d and get Driver Sweeper
Driver Sweeper installer

Driver Sweeper no install needed "this is what I use"
First open up your C drive and you should see the NVIDIA Directory "unless you told it to install some place else", now open up the folder named WinVista64 or 32 "depending on your os" and you should see a driver Ver. folder 162.22 for example Leave this window open.
Vista
1. Right click on Computer---->Properties
2. Click on Device Manager
3. Expand Dislpay Adapters
4. Right Mouse Button over the Video card Name
5. Select Uninstall, Click Delete the driver software for this Device
6. Do not reboot
7. Now That Window I told you to leave open with the NVIDIA directory now Delete your Driver Vershion Folder Example 162.22 then empty recycle bin.
8. REBOOT
9. Restart in Safe mode, Use the F8 key while your rebooting to do so select Safe Mode.
10. Now run Driver Sweeper or Driver Cleaner Pro, "I personally use the Driver Sweeper that you just run no install"
11. Make sure you tell it to Remove your NVIDIA Display Drivers, once it is finished
Reboot. once Vista reboots it will just reinstall a genaric VGA adapter dont worry, at least its not the nvidia one.
12. Now Install the latest Video Drivers for your card. Your safest bet are the ones on the EVGA support Site. "links below"
13. Once it is finished installing REBOOT
14. Happy Gaming
Windows XP is basically the same proccess just follow the guide and it should be easy sailing.
Driver Links
200 Series

9 Series

8 Series

5/6/7 Series
NVIDIA PhysX System Software
"Never let microsoft windows update install your video drivers for XP/Vista for mobo and display drivers, when you do this, and when you select search online to install new hardware every time, it will not even let you do my guide, unless you have your computer unplugged from the net."
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Heat: If your video card is running way too hot you may want to get EVGA Precision to rev up your fans. Also for Overclocking.
For EVGA Customers here is Precision, Great app for those of you who have not used it.
Not an EVGA Customer get RivaTuner
If you have owned your card for awhile its cooling poorly and have not cleaned it... Check it for Dust Bunnies!!!
I would also like to say have the approved SLI case from nvidia, if your in sli or not... Also if you have 8 series cards and going SLI dont go with the cheaper sli cases your bottom card is going to get mad hot .... and cause all your temps to raise to unsafe temps for your gpus...
Say No to Ntune knowing is half the battle
This program will make your computer act up, funky, ect do not use it, its just like drugs just say no.... Trust me and alot of us here this will save you alot of time. So Say No to Ntune!!!
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Also a Word of WARNING, this guide is for people who do not install all the bloat ware like ntune ect that come on your video card cd's on purchase. Some reported problems of the driver cleaning applications getting rid of the ntune software for raid, Lan drivers ect. Personally in my experience, do not use them, each time I buy a product esp EVGA I go to the EVGA web site and download all my drivers manually so I do not have to mess with nvidias disk installers and just get the drivers I want.
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This Guide can also be used as a trouble shooting guide if your card is having issues, following this will let you know if it is the drivers or not. Using this method will let you know if its your drivers that are giving you all your issues, BSOD's, Hard Locks, Random reboots. Doing the above has fixed many peoples issues including my own. Has Saved me from ripping my hair out of my head a few times.
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Something else to try: Check all the connections inside your rig, power cables, hard drive cables you name it, also check to make sure your hardware cpu, ram, video card are seated in correctly. Make sure your NB is not blowing hot air directly into your video card if so find a way to move that hot air out of their fast.
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Helpful Hint On Gaming Slow Downs: If your running any video card that you can plug two monitors into and actually have 2 monitors plugged into one video card. And your games are running slow, or have some lag in them, unplug a monitor! Trust me this will save you alot of time and effort.
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SLI Running Slow?
This can be caused by a few things, your bios on your mobo needs to be updated or rolled back. Not enough power from your psu, or psu issues, maybe a bum video card, or you got a case that is not great for sli and does not get enough airflow to your cards. You can also check out
CraptacularOnes SLI FAQ

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Getting the nvlddmkm error even after my driver guide? Check the voltages on your ram if your motherboard is auto configuring your ram it could be putting in the wrong voltage or timings, I would suggest you doing this manually, to the settings your ram is supposed to be running at in bios.
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Socket A Kings Guide for modifying bios for motherboards with incompatability with the 8800 GT possible solution.

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RussianHaxor Guide for replacing Thermal Compound on 680i/650i Series boards for better cooling and longer life span. Prob works on the 750-790i series as well..

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Need a Cheap Easy GPU Cooler, works and gives you Some Head Room for OCing?

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More than 4gigs of ram in Vista Constant BSOD? This may help you out

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8800 GTS/GTX bios updates for Apple Cinima Displays" Thanks Jacob"
You can download them here: Wondering if there is an Ultra bios Fix.
ftp://ftp.evga.com/bios/N831.exe (8800GTX)
ftp://ftp.evga.com/bios/N821.exe (8800GTS)
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Nvidia Hotfixes for Vista if you do not have them already