Windows 7 ultimate -- bootmgr is missing !

[bdmember]

Hello,
I am using a Dell Inspiron 1545 Laptop. I have got a problem i.e. BOOTMGR is missing. All this blunder happened when I accidentally marked one of my partitions as active. To resolve this problem, I again made a huge blunder. Without understanding, I formatted and deleted that partition for installing a new Windows 7. At present, I have an unallocated Disk space of 75GB, but whenever I try to make a new partition, a window containing this message appears: "Windows installation encountered an unexpected error. Verify that the installation sources are accessible, and restart the installation. Error code: 0xC0000005".
Please anyone help me regarding this matter. I AM IN REAL TROUBLE...!!! THANKS...

 

[theog]

Check your ram.

http://www.sevenforums.com/tutorials/715-memory-diagnostics-tool.html?ltr=M

Memtest86+ - Advanced Memory Diagnostic Tool

Check your HD.

http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html?ltr=S

Check with a hard drive diagnostic tools.

Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.

 

[gregrocker]

Did the laptop come with Win7? If so, try to run Recovery using key given on first bootup screen, or in manual.

Are you working with Recovery DVD or Win7 DVD? Boot DVD, select Custom install, then select deleted partition to install. If this fails, use Drive Tools to delete again, create New and format a partition there to install.