Windows 7 XPS 410 issues

I just upgraded to Windows 7 yesterday, and it was working perfectly fine. I had Windows XP Pro 32 bit and I upgraded to Windows 7 Ultimate 64bit. I did a clean install of Windows 7. I downloaded some apps like Firefox, and McAfee Internet Security. I ran Windows update and there were 9 important updates and about 35 other non-important updates, which basically consisted of language packs. After the updates downloaded, about 2GB, I clicked shut down and install updates. The next day I turned it on and when it got to the "Windows Starting" screen something came up saying "applying update operations" and I just let it sit for a while, it was counting to 745000, at the rate of 15000 a minute, so it took a good 50 minutes. A couple hours later I come to see the computer off. I start it and it says that "Windows failed to start. A recent hardware or software change might be the cause." I am beginning to suspect a Windows update just messed up my computer. I remember there were nvidia driver updates in it and a bunch of language packs as well as some Microsoft updates. It keeps telling me to launch startup repair, and when I do it goes to a black screen and never works. I tried safe mode and it still doesn't work. I tried some other stuff on the boot menu, and they don't go past the "Windows Starting" screen either. I would like to say I know about computers, but some of the stuff I read online I really had no clue what they were talking about. I have a 3 year old XPS 410, with an Intel Core 2 Duo 6600 2.4GHz processor, an Nvidia GeForce 7300 LE graphics card, and I just upgraded to 4GB of RAM. I have no idea what I did wrong, because Windows 7 was running really well yesterday, but now whatever I do I cannot get passed the "Windows Starting" screen. I even tried to go back to XP 32 bit with the Dell disc, and I started the install on the same partition and it just stopped working at the deleting old windows process. I really do appreciate any help and advice any of you may have. I really don't know what to do. I still have a Dell warranty for another year or so, and I'm really considering to take it to a local repair shop. I am just hoping that I am not the only one with this problem, and that there is an easy fix around this.