That's a crap schematic if you don't mind me saying so...
1) MCLR is left floating - should be pulled high via a resistor between 1K and 10K.
2) No supply lines to the PIC - as stated Vdd to +5 with Vss to GND
3) No decoupling capacitor - Place a 0.1uf Capacitor across the supply lines as close to the PIC as possible
4) IGNORE
5) IGNORE
6) No values for the pull down resistors - You need to state what value components are being used - again 1K - 10 K pull up / down resistors are the norm.
7)IGNORE
OK ignore some of those comments - I've juts worked out which way the tracks are running --- I'll wake up in a moment !!!
Can you also state where the 5v is coming from and have you measured it to make sure it is 5v and not 6v or 3v or 8v dc. If you are not sure then use a 7805 regulator to ensure the voltage is as close to 5v dc.
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