Nitro microSD getting corrupted & loss of files

I was working on an Excel 2010 file on my Win 7 x64 laptop & it's running low on battery so I saved
the Excel file to a Nitro MicroSD (that's inserted inside an SD adapter that comes  bundled with the
Nitro).

Then I worked on another laptop (Win XP x32bit) that has more battery that uses Excel 2003 with
an MS converter: amount of data entered into Excel is like 3 over hours of data entry: Excel 2003
 disallows me to do "Save" as it indicated "Read Only" so I did "Save As" to save another file name
& the converter saves it to the Nitro as an .xlsx (this is an Excel 2010 format) after conversion
without any error message & I hibernated my Win XP laptop properly.

Now both the Excel 2003 on the Win XP as well as the Excel 2010 on the Win 7 laptops (as well as
my kid's MS Excel 2013 on her Macbook when I emailed it to her) could NOT read this saved xlsx
 file, giving the error message shown in attachment 1.

Q1:
I need back this Excel file as it's worth more than 3 hours of work.  How can I recover back the
Excel file with 3+ hours of work?

Q2:
What's the next best courses of actions I should take now?  I reckon there's something wrong with
this Nitro microSD which I got from Amazon.  All my previous SD & thumb drives which I work &
copy Excel files between the 2 laptops never gave this issue, so don't think it's a laptop nor
Windows nor MS Excel issue but the Nitro or the microSD to SD adapter issue.

Q3:
How do I determine which component is at fault?  Do I copy out everything first from this Nitro
& reformat it to prevent future recurrence?  Read that this Nitro is a fast thingy, so not sure if
the two laptop's SD reader slots cant copy with the speed?

Subsequently when I copy more files to this Nitro from the Win 7 laptop & did a directory listing, it
gave lots of garbage characters as shown below:

 Directory of E:\ipfeb

[.]
[..]
010215-080215.csv
16to28T25Feb.zip
16_28Fb.csv
16_28T25.csv
16_28T25Tr.csv
1to22T25Feb.zip
1_15Febt25T.csv
1_15Febt25Tr.csv
1_28Febt25Tr.csv
1_28FebT25Tr_Rejonly.xlsx
1_28FebT25Tr_RejonlySml.xlsx
1_28Febt25Tr_woAction.csv
1_28Febt25Tr_woAction_DropMononly.xlsx
1_28Febt25Tr_woAction_DropMononlySml.xlsx
1_8Febt25T.csv
9_15Fb.csv
9_15Feb.csv
9_15t25FebT.csv
alT25Feb.csv
alT25FebTnogood.csv
BBBFebtopIps.xlsx
Cl_Top5_Event_Feb15_V2.xlsx  <== good original Excel
Cl_Top5_Event_Feb15_V3.xlsx <== bad unreadable Excel
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              76 File(s) 185,396,831,180 bytes
              41 Dir(s)   5,086,674,944 bytes free
CorruptExcelNitromicroSD.jpg