Driver crashes, glitch blobs/lines

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I have a EVGA GT 430 and yesterday it kept showing glitchy lines, blobs, etc. (My Monitor is not the problem). However, I discovered that the problem was that the card was not put into the motherboard exactly right. I fixed it, but today, I noticed that it had shifted again, and was causing the same problems. Is there anyway to keep it in place?

Also, Whenever I try to watch hulu (Even when the card is in the right place), the driver crashes every ten seconds. I installed the Nvidia drivers for my card, so should I install the EVGA drivers that the card came with instead to fix the problem? (The reason I haven't used the EVGA disc is that when I did that yesterday, when the card was not in the right place, it gave me a BSOD)
Thanks!

 

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UPDATE: The driver crashes have stopped, but the glitchy lines and blobs have not...I think its because the card keeps moving slightly...Is there a way to hold it firmly in place?