Help need advice (processor)

i want to upgrade my processor (e4500 intel core 2 duo lga775) as the 1 i have is starting to fail.
I want something that is faster can someone plz advise me on which processor would be fine for my mobo (n15235 foxconn) thanks in advance

If this is your board http://h10025.www1.hp.com/ewfrf/wc [...] dlc=en#N92 I suggest looking at an E8xxx Wolfdale CPU. Are you sure the CPU is failing it would be more likely the motherboard.

I agree with Rolli59. It's not likely the processor is "failing". Processors generally work or don't work. Perhaps you could relate the symptoms that made you think it was failing... you may just need to clean the crap and registry errors your system has accumulated.

i tried a intelcore duo Q6600 in my pc and it keeps crashing my pc after a little while would this be cos i haven't put enough heatsink compound on or some other reason ?????

Try cleaning the PC with CCleaner. Do the Clean and Registry both. Defrag.
If it still crashes, it could be a graphics driver issue. Uninstall the existing video driver and then run Driver Sweeper from Safe Mode (F8 at bootup). Have it remove any remnants of Nvidia and AMD drivers it finds. Re-boot and install the latest driver for your card/ O.S.

CCleaner: http://www.piriform.com/ccleaner
Driver Sweeper: http://phyxion.net/item/driver-sweeper.html

Installing a Q6600 in place of your old processor may require a BIOS update. But if the board recognizes the processor at bootup, probably not. (I believe your board is a Foxconn OEM board. You may be able to search for a Foxconn PT 890-8237A BIOS online if you need one.) When you started Windows after installing the Q6600, did Windows say it was loading the driver for that processor and then ask to re-boot? If so, the O.S. probably is good with the change.

p.s. can't download ccleaner