Battery not holding charge AFTER update

I have a macbook (early 2008) white which would hold approx. 4 hours of charge. Last week I saw an update for macbooks regarding battery issues and since it mentioned the model I had I downloaded that update. Since then a 100% charge allows me less than 2 hours (only about 1:45 worth of charge).
Please HELP! How can I revert to the original state and why has the update caused a fall in charge capacity? Thanks in advance. Details given below:
Model Information:
Serial Number: DP-ASMB016-38d2-c7a9
Manufacturer: DP
Device name: ASMB016
Pack Lot Code: 0003
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0102
Charge Information:
Charge remaining (mAh): 3533
Fully charged: No
Charging: No
Full charge capacity (mAh): 3806
Health Information:
Cycle count: 596
Condition: Fair
Battery Installed: Yes
Amperage (mA): -2485
Voltage (mV): 11889
Mac OS X 10.5.8 (9L31a)

Full charge capacity (mAh): 3806
Cycle count: 596
Condition: Fair
While I cannot address why the problems may be manifesting after the update, the numbers above led me to believe your battery is on the way out. Your full capacity is about 75% of what it was new, and your cycle count is about double what Apple tends to warrant batteries for. "Fair" is also a clue that your battery is starting to wear out.
You can try resetting the SMC, but I'm guessing that you won't get much time back from a battery with these numbers:
http://support.apple.com/kb/ht3964

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