I've been brought here by trouble regarding my Nvidia GPU. Two days ago, I was prompted to install a new driver for it (by the card's own program, as usual). I accepted, and launched the installation. At first, it told me that Steam was preventing it from installing, and asked me if I'd like to shut it down and install again. I clicked yes, but Steam didn't exit, and the driver was starting to install, so I exited Steam manually.
After this I had to leave the PC for a bit, but when I returned it had restarted, claiming that 'a problem caused an unexpected shutdown' etc.
Since then, I tried playing a few games but noted very poor performance. I instantly thought of the driver again and checked out my Nvidia software. The hitch: My card is completely undetectable. I have tried re-downloading the driver, only for it to find no Nvidia GPU itself. My computer has switched to using the integrated graphics (hence the terrible performance in games) and this is all that shows up in Windows Devices. In Nvidia GeForce Experience, there's just a blank space everywhere my card model is supposed to be listed.
So, do you think this is something you can help me with? Thank you in advance for your time and effort.
PC model: Lenovo Ideapad Z500
OS: Windows 8
GPU: NVIDIA GeForce GT635M