You are definately running a 32 bit version of XP. SP3 is for the 32 bit version. The 64 bit version only had SP2.
So, with that confirmed,
Click Here and make sure DEP is ALWAYS turned off.
The JIT error is related to .NetFramework. If you have done all the MS updates, your .NetFramework should be at 4.5. Because it is not, I think you may have a corrupted .NetFramework load.
Click Here for the MS .NetFramework 4.5 that should load a clean version of .NetFramework 4.5.
With DEP turned off and .NetFramework up to date, the application should run without problems.
Rcaman
