Hello everyone as the topic says, I have a problem with removing windows 8 on my laptop and overall problem with the system is:

Problem 1: I was getting blue screens EVERY now and then,

Problem 2: When, I GO into the BIOS trying to select a proper boot device, it says that my BIOS is not reading my hard drive so, I can't boot my system.

Problem 3: I tryed to insert a Windows 7 CD, install and remove my partitions via CD and it does not work, the CD is moving very slow and not reading it properly:

Problem 4: It says something like that:

Intel UNDI, PXE-2.1 [build 083]
Copyrights [C] 1997-200 Intel Corporation

This product is covered by one or more of the following patents:
US5,307,459  US5,434,872  US5,732,094   US6,570,884   US6,115,776  and  US6,327,625

Realtek PCIe GBE FAMILY Controller Series v2.46 [03/23/12]
PXE-E61: Media test failure, check cable

PXE-MOF: Exiting PXE ROM.

Reboot and select proper boot device or insert boot media in selected boot device and press a key

Problem 5: In BIOS, I tryed going into the boot option and select "Boot option priorites" and it only says this:
P2: PIONEER DVD-RW DVRTD11RS
Realtek PXE BO3 D00
P0: ST9500325AS   <--- and none of them works...

Problem 6: No, I cannot ENTER windows selection mode, becuase it does not read it. Everytime it says: Select a proper boot device etc...

Suggestion: One of the local store specialists, I went there and ask what should, I do. He said that, I should completly remove the partition and format it, but I can't even acces the "Delete parition" selections

so, anyone can help me? that'd be great.