I have a 1992 Volvo 240 Wagon and the hood will open, but it will not shut completely, it looks shut, but when starting to drive, it pops up before flying up to the window, any ideas?I tried WD40 and other remedies, but the hood wont simply stay in place. I need to get this done, so i can get the car inspected.

Three part solution,
1. Lube the hood locks (yes there are two) the one you manuver from the inside (make syre you get the WD40 inside the hole wire and the latch you flipp from the outside when you open the hood.
2. Make sure the return springs for both locks are not broken otherwise no amount of lubing will help.
3. Adjust the lock. Open hood, remove grill losen bolts for the locks slightly, adjust and make sure they engage and release properly, tighten locks again and reassemble.