How do I revert OS X back to a time before the last update on 28th June?

Hi.
Last Tuesday, 28th June, I authorised Mac Update to update two things. One was something to do with my Epson printer, and the other was some sort of security update for Mac OS X itself. The update, presumably the latter part, invoked a requirement to restart my Mac.
Since then things have not been good.
I have noticed that the fans in my MacBook Pro are on more or less continuously, even when it is asleep. Prior to last Tuesday they hardly ever ran, even when I was using it. (According to iStat my CPU is currently 76 degrees C, and both fans are running at about 6000 rpm.)
When I try to quit Safari it doesn't quit straight away as it used to. Instead I get the spinning ball for a while and then, after it quits I get a 'Safari quit unexpectedly' report, even though it was I who initiated the quitting...
Several apps have been acting oddly too, such as MS Word taking ages to launch.
So I want to revert my MacBook Pro to how it was prior to this last update. I have Time Machine enabled, but I can't work out how to get the actual OS back to a state it was on a date prior to 28th June. The OS isn't in the Apps folder, and I can't work out where it might be.
Can someone please point me in the right direction, or is this something that Time Machine cannot do?

Your slow down issues sound like it's internet related.
http://support.apple.com/kb/TS3802
Under your System Prefs > Network > Advanced > Airport > TCP/IP  Configure IPv6: OFF  Reboot.
Run ALL of the free OnyX cleaning and maintainence
features and reboot.
Also run the Verify>Preferences and write down any corrupted
ones, move these files to your desktop (out of yourLibrary/
Preferences folder) and reboot, they get rebuilt automatically.
(more free good stuff you'll likely wind up needing)
VLC (plays anything)
Perian (installs additionalQuicktimecodecs)
FlipForMac (Windows media in Quicktime)
TheUnarchiver(unpacks just about everything)
Carbon Copy Cloner (clonesbootdrive to another HFS+j drive, hold option bootable)
2 free 3D games - NexiuZClassic and Cube 2 Sauerbraten
LibreOffice (freeofficesuit, reads/writes Office files
Gimp (free image editor)
OnyX (free maintainenceandcleaning)
Pacifist (opens DMG filesforextraction)
Mactracker (inforonApple products)
NTFS Mounter (for WindowsNTFSdrives)
EasyFind(deep search)
TimeMachineEditor
TinkerTool
ClamXav (free anti-virus)
Caffine (keeps yourMacawake)
Browswerplug-in check (especially for Flash!)

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