Looks like you have a memory leak somewhere.
If you don't use any DLLs (which can quickly lead to memory leaks if they're badly programmed) then I guess you must be leaving some references open which you should really close. YOur application sounds like you're using VI server.
Are you kkeping track of your open references, and closing them all afterwards in the right order?
Shane.
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)