Since I don't know what you have tried all I can do is make suggestions.
Invalid Partition Table- 3 Procedures to Resolve It:
Method 1 (Windows 7)(Repair partition tool option)
Your computer should display the BIOS screen. In some cases it's just a black screen with pile of particular white words, but often it could be the PC manufacturer's logo such as in the case of dell computers.
Immediately the bios screen should no longer on there press and hold "f8" key to bring out the advanced boot options menu, and then select repair your computer to load windows 7 recovery environment.
You should directly choose your keyboard layout from drop-box, login with administrator account to access systems recovery options windows and click the command prompt.
Spell out in "bootrec". Then typewrite in fixmbr. If these first techniques do not work then, then begin from the top by typing in " bootrec". Fixboot" for a 2nd effort and "bootrec. RebuildBcd" for a 3rd try, also omitting the question marks at the command prompt at each attempt.
Method 2 - Update Bios Parameters
Search for and demount the battery on the motherboard and confirm if the plus side is up or down. Whenever you do this it will make the operation of putting back your battery a lot uncomplicated and takes out mix-up.
Await for about 1 minute after which you can then reinstall the battery, latch the electrical and reboot up the computing machine.
You will instantly be noticing a bios cautionary message exhibiting that the cmos was changed or corrupt and you might need to enter the bios setup to set date and time.
Restart widows and checkout if the mistake is mended.
Method 3 - (Booting Method)
The next inquiry will appear: Do you want to enlarge disk support (yes. No).
Select: Yes.
You will taken right away to determine if there are any active partition by typing the number: 2
To encounter the active partitions you will be required to examine under the status column, this where the operating places the active partitions.
If you can't encounter any active partition set then type the number of the partition to make it active.
To find out if your computer issue has been repaired you need re-boot your computer, and you want to establish sure that you go through all the functions to warrant that you did it correctly. If your problem is still not mended then you have to map out the disk and reinstall the operating system.