Hopeless: memory not being released

[TupacShakur]

This is a hopeless case. I might as well finish writing an O.S before solving it, but here goes:

This problem is related to the topic of the other thread i posted few days ago, and titled: Huge Files/Memory Problem (Link).
That thread prompted me to change the whole structure of my program to adapt to the use of small (1 or 5 MB) buffers in reading from huge files (a 500 MB file for example), instead of the 100 MB buffer i was using at some point. Now the new way naturally has a longer loop (100 times x 5MB) instead of (5 times x 100MB).

In the old way, i was using a string buffer that i was freeing after each iteration by doing: StringVariable = "", thus freeing the RAM. At the end of the procedure, RAM (that went down by 200 MB's cause each byte is represented by 2 bytes in a String type variable) would return to normal.

In the new way (which should be much better), it seems that the long loop is at some point (1/3 of the way) freezing the memory freeing. Meaning that the StringVariable = "" is doing **** from some point on, thus getting the Ram down to 5 MB, and staying like that after the end of execution (although i am using the same variable as the buffer).

So what can i say??? HEEEEEEEEEEEEEEEEEELLLPPP!!!!!!!!!


P.S: I searched this forum, and it seems the the only way to free a string var (and what Microsoft has suggested doing) is the StringVar = "" statement.