Basically as the title says. My old GeForce 6600GT blew up Sad and so at the moment I'm using the built in 5900MX. However, the system takes about a minute to boot up now.

If I remove the nVidia drivers, then the lag isn't there. I've used a tool to totally wipe the drivers out, but to no avail.

Using Bootvis, Microsoft tells me that it's the Videoprt.sys file that's taking over 40seconds to load, at 100% CPU usage.

I'm at a loss as to what's happening. I've made sure the old GT drivers have gone, I've also reset the ESCD in the BIOS to make sure it's not some sort of conflict.

Anyone able to shed some light on the subject?

I had exactly the same problem with mine (7600GT). Sometimes for me it would take over a minute, sometimes it wouldn't even get to the welcome screen at all. After uninstalling them the boot time was much quicker and it managed to boot every time.

Try fully updating Windows, then uninstall the nVidia drivers and reinstall them in safemode. Could be coincidence, but this has worked for both me and vaccination so it's worth a shot.

Thanks for the suggestion.

Unfortunately, after trying this, I still have the same problem.

Although the problem sounds the same, this computer always takes the same length of time to boot up - around 64 seconds, 43 of which is due to videoprt.sys.

Are you using the same drivers from your GF6600?

Download the newest drivers from nvidia site, and make a fresh install (first uninstall, restart, install the new drivers)

Yeah done that as well.

They are the same drivers though - thanks to nVidia's unified driver architecture. (I did re-download them just in case).