Doesnt want to reboot. loading bar stays half way

i just recently updated to Yosemite update and it installed properly and everything was working.
i rebooted it because it was a bit slow and when it rebooted it doesn't want to fully reboot. I input my password
and it accepts it but the loading bar stays at half way and doesn't want to boot up. I've kept it there for hours and
it doesn't change? what do i do?

Yosemite: boot hangs at 50% percent

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Microsoft Windows XP Professional Service Pack 3 (Build 2600)
To Be Filled By O.E.M. To Be Filled By O.E.M.
iTunes 10.4.1.10
QuickTime 7.7
FairPlay 1.12.20
Apple Application Support 1.5.2
iPod Updater Library 10.0d2
CD Driver 2.2.0.1
CD Driver DLL 2.1.1.1
Apple Mobile Device 3.4.1.2
Apple Mobile Device Driver 1.55.0.0
Bonjour 3.0.0.2 (333.2)
Gracenote SDK 1.9.1.485
Gracenote MusicID 1.9.1.102
Gracenote Submit 1.9.1.133
Gracenote DSP 1.9.1.43
iTunes Serial Number 0013ABB008AC93D8
Current user is an administrator.
The current local date and time is 2011-09-02 22:30:04.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is not supported.
Core Media is supported.
Video Display Information
NVIDIA GeForce 9500 GT
**** External Plug-ins Information ****
No external plug-ins installed.
iPodService 10.4.1.10 is currently running.
iTunesHelper 10.4.1.10 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name:          {A79C6388-32E4-4F09-A40E-0BE4B287383F}
Description:          Dynex Wireless G Enhanced Adapter - Packet Scheduler Miniport
IP Address:          192.168.1.2
Subnet Mask:          255.255.255.0
Default Gateway:          192.168.1.1
DHCP Enabled:          Yes
DHCP Server:          192.168.1.1
Lease Obtained:          Fri Sep 02 22:11:09 2011
Lease Expires:          Sat Sep 03 22:11:09 2011
DNS Servers:          192.168.1.1
Adapter Name:          {52FECBEC-8B1D-4138-80FC-DD5990BE864C}
Description:          Realtek PCIe GBE Family Controller - Packet Scheduler Miniport
IP Address:          0.0.0.0
Subnet Mask:          0.0.0.0
Default Gateway:
DHCP Enabled:          Yes
DHCP Server:          192.168.1.1
Lease Obtained:          Tue Sep 14 10:13:18 2010
Lease Expires:          Wed Sep 15 07:35:39 2010
DNS Servers:
Active Connection:          LAN Connection
Connected:          Yes
Online:                    Yes
Using Modem:          No
Using LAN:          Yes
Using Proxy:          No
SSL 3.0 Support:          Enabled
TLS 1.0 Support:          Enabled
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iTunes is enabled in Windows Firewall.
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Connection attempt to browsing iTunes Store was successful.
Connection attempt to purchasing from iTunes Store was successful.
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Connection attempt to Gracenote server was successful.
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This doesn't work for everybody.   Case in point:
How many of you use the gaming NICs from Bigfoot Networks like the Killer Xeno Pro and so forth?   You can type: netsh winsock reset   all you want, but when Windows 7 reboots, you get a message box saying the "LSP needs to be reset. Do you want to do this now?"
If you say NO, it will keep popping up and annoying you until you do.   In the meantime iTunes Store loads perfectly. Once you allow that message to reset the LSP, the iTunes Store no longer loads.   I have brought this up with the people at Bigfoot Networks by putting in a trouble ticket...for whatever good it will do.
These NICs are supposed to be fine tuned and tested for online gaming and I've never had an issue with it until now. My iTunes has always loaded just fine with it before iTunes 10.5.   So, maybe it's an issue on Apple's end as well.    I just wanted to post this an let everyone who owns these cards know what I found.
Thanks.

Doesnt want to reboot. loading bar stays half way

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