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There are a few things that could be causing this.
1) This one is a must do. Remove and inspect the chip labels on your memory sticks. Do all four sticks have the same chip maker name(HYNIX) on the label? Are both sets the same speed? (i.e. PC6400 or PC5300)?
When memory sticks of different speeds are installed in DIMM slots, the OS will always drop the memory bus speed to the slower stick's speed.This most likely to be the the cause of slow memory response in your system. Mixing different chips between pairs of memsticks always causes memory issues.
2) Right-click Computer --> select Properties --> Advanced Tab --> Select Settings under Performance --> Advanced Tab -->Select Virtual Memory --> select Change --> put tick in Custom size --> put the number that is in recommended (total paging size for all drives) in both initial size and maximum --> select set and restart your PC. This is a virtual memory tweak used to slow down the effects of the always present Microsoft Windows memory leak problem.
How does your PC respond when only the 2 x 2GB memsticks installed?
BTW..Really good catch on the msconfig.
If there was a tic in the max memory box then HP did it in the script for the OS install. It is not normally selected. I gave you a Kudo for that.
Update: I just looked at some Samsung and Hynix memsticks in my box of DDR/DDR2. each one manufactures chip and builds modules with their own chips so yours are probably the same. That means mismatched memory modules are probably in your system's DIMM slots.
