Hi;
Assuming 2 of the same OS (XP) were installed
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Goto:
START
RUN
Type:
msconfig
Choose:
Boot.ini
Edit OUT(but no more than that) the 2nd line under:
Operating System
It reads like: multi(1)disk(1)... (1) here means D:
Leave alone:
LINE WITH: multi(0) disk(0) IT IS NEEDED 0 = C:
Save and Exit.
Afterwards:
Clean the D: drive off of D:\windows and \D:\program files (at least those)