cannot install nothing new

Hi i have problem still. i try all i change in regedit i spend 10h already and still out of solution.
My problem is.some time ago i noticed i cannot update my nvidia card(i was thinking nvidia problem) now today when i start update i downloaded file and when try open it starts load and nothing.so i try randomly intel graphics exe what i installed while ago and bang same stuff.some small exe files i can open i can open exe files what already installed before like was my nvidia old drivers before.but cannot install nothing new ? any help please ? i try in boot mode nothing helps. i restored pc to 3 days back and i got restore error about nvidia that cannot restore thatone anymore but i guess cus it was already unistalled. ? any solutions ?

Work through the Troubleshooting Steps for Windows 7. Start with disinfection, a Clean Boot, enable Automatically deliver drivers via Windows Update (Step 3) to run all Important and Optional Windows Updates to get vital patches and drivers. Then circle back to complete all other steps.

Report back results as you go as we may have other steps.

AddRAM said:

Hard to help you without knowing your laptop model.

Where are you getting the video drivers from ?

All my life i download from nvidia homepage.
x32 installers no work same for this. i scare i messed up once all in servicess i never play with them but once with some soft i disabled some of them? but now i try eneble all for windows servisess but i dont undestund do i need to restart after that ? seems like many of them stopp working again after restart.
I go really crazy i think i read more than 50 different topics and done so much that i scare some services problems. but i live all to you guys cus lets face it i did account here cus brain not huge enough to do something more. all what u need i provide here about my pc what u need

My pc specs.

Dell xpsL701X
i3 m370 @2,40ghz
4 ram
Intel HD Graphics 1242mb
and i have nvidia card m430
windows 7 home premium x64

AddRAM said:

Dells are funny, go to dell.com and download the video drivers from there and give those a try.

like i say i downloades from there dell all but cannot install from there.all what windows automaticly installed after restart i mean intel and nvidia adapter,thats it nothing more cannot

In addition to the other steps you've been given to work through:

How to Fix “ThWindows Installer service could not be accessed" error message when you try to install Office e Windows Installer service could not be accessed” Error

You can consider a Repair Install

But if you are still running factory preinstalled Win7 then that is a grossly inferior install that no tech enthusiast would run to begin with. I would follow these steps to do a perfect Clean Reinstall - Factory OEM Windows 7. Be sure to take note of the Special Notes for Dell Owners at the end.

gregrocker said:

In addition to the other steps you've been given to work through:

How to Fix “ThWindows Installer service could not be accessed" error message when you try to install Office e Windows Installer service could not be accessed” Error

You can consider a Repair Install

But if you are still running factory preinstalled Win7 then that is a grossly inferior install that no tech enthusiast would run to begin with. I would follow these steps to do a perfect Clean Reinstall - Factory OEM Windows 7. Be sure to take note of the Special Notes for Dell Owners at the end.

wow i just noticed my windows installer servise is gone from msconfig servisess and when i open in run services i dont find there also.but im very sure it was yesturday there windows installer and module installer.
and i just opened my nod and i see 17 infections was removed at night. is it possible windows installer got infected ?