The problems are PILING up and driving me insane. Please help.

When I try to start up my computer, it does one of SEVERAL things. 1) it doesn't beep at all and therefore needs several hard reboots before it gets to my screen. 2) Blue screen of death. 3) Freezes once in windows and needs to be hard booted to start again.

By the way, I can only load into my OS through the disk as apparently I am missing my boot manager. I have tried to reinstall the OS and have tried repairing it but without the disk in my drive I cant get into windows 7.

I have attached my DxDiag if that helps.

Thanks in advance.




Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.110408-1631)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: AMD Phenom(tm) 9850 Quad-Core Processor (4 CPUs), ~2.5GHz
Memory: 4096MB RAM
Available OS Memory: 4094MB RAM
Page File: 1542MB used, 6644MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup PARAMETERS: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode

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DxDiag Notes
------------
Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Sound Tab 2: No problems found.
Input Tab: No problems found.

--------------------
DirectX Debug Levels
--------------------
Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)

---------------
Display Devices
---------------
Card name: NVIDIA GeForce 9800 GTX+
Manufacturer: NVIDIA
Chip type: GeForce 9800 GTX+
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0613&SUBSYS_C8843842&REV_A2
Display Memory: 2286 MB
Dedicated Memory: 495 MB
Shared Memory: 1791 MB
Current Mode: 1280 x 1024 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: HP vs17
Monitor Id: HWP2647
Native Mode: 1280 x 1024(p) (60.020Hz)
Output Type: HD15
Driver Name: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Driver File Version: 8.17.0012.7533 (English)
Driver Version: 8.17.12.7533
DDI Version: 10
Driver Model: WDDM 1.1
Driver Attributes: Final Retail
What is new or different since the last time everything worked properly (ie, new hw, new sw, virus, error, etc)?The newest hardware would be a wireless-N usb 2.0 adapter but I have been using it for 8 months with no problems until now. I took it out and restarted computer without disk and still couldn't get PAST "no boot manager screen" without the start up disk.
I run virus protection regularly and have found nothing.
I suppose it could be a boot up virus but not sure how to find out besides running a virus scan which finds nothing.Boot to the W7 dvd and try startup repair OPTIONS.