Windows Error with new Graphics Card

(Somewhere in this process, the error occured.. including all details..)

Wanted to get a little extra life out of my 5 year old desktop:
i7 960 @3.2 ghz
570gtx graphics
still using win7

To get a year or two of decent gaming use...decide to boost RAM/Graphics:
(spend a couple hundred instead of a couple thousand)

Bought a new graphics card: asus 750gti
Was only using 3 of 6 RAM slots(12gb), bought 3 more sticks to double RAM

1 installed Card
updated drivers through NVidia GeForce Experience

2nd Day decide to hook up second monitor.. since I had it.. also did a GeForce driver update iir

3rd day, RAM arrives, goto install. Only showing 20GB not 24..

4th day.. had time, pull out/ reseat new sticks .. still 20.. might be a bad slot.

Come back a day later, shuffle new RAM locations one last time to try an identify slot or RAM..
*freezes on reboot at windows graphic..*
...starts in safe mode.. but otherwise, nope..

Today, remove all new RAM, still freezes on startup
Safe Mode: don't have an available restore point for some reason
Rollback drivers on video card
Boots properly.
Used for an hour or so.. did a reboot while updating something unrelated.. frozen at windows graphic again.

Finding now: if I freeze during windows startup.. and tap reset button to try again, second effort seems to get through...

Wondering if just updating to Windows 10 might fix whatever the potential clash is..?
(Still have new RAM out.. for no other reason than, trying to now address one thing at a time.if the slot is bad, can just run with 20)

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Clarification Request
What PC is this?

Some HPs will NEVER boot with the 750 plugged in. Fix? move to 900 series or ATI.

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But there are now too many PCs that won't boot with some 750 GPUs.

I'd share a google on that but with you able to do that, I leave it to you. Try another make GPU.

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