Whole computer freezes when Internet connects

My computer has been experiencing the beach ball of death. But only when it connects to the Internet. When the wifi is switched off and no network cable connected then it works perfectly. However when I connect to the Internet either through my iPhone hotspot or my home broadband it slows to an absolute crawl. This does not happen to other computers on the same network. I have checked the network and it seems to be fine. Can anyone help me? I can't find similar articles. I have a mac book pro on 10.8.4

Thanks Linc
I have done as you suggest. Below is me connecting my wifi and then going to Safari and then opening a webpage. During that I got the beach ball of death twice.
It seems to have I/O errors occuring at this point. From a very quick look around this seems to involve a problem with my hard drive - although this only seems to be occuring when I am connected to the internet and I don't get the ball of death othertimes...?
Can anyone help?
7/08/13 8:55:44.000 PM kernel[0]: en1: 802.11d country code set to 'AU'.
7/08/13 8:55:44.000 PM kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 12 13 36 40 44 48 52 56 60 64 100 104 108 112 116 132 136 140 149 153 157 161 165
7/08/13 8:55:45.000 PM kernel[0]: MacAuthEvent en1   Auth result for: 00:60:64:a3:48:94  MAC AUTH succeeded
7/08/13 8:55:45.000 PM kernel[0]: wlEvent: en1 en1 Link UP virtIf = 0
7/08/13 8:55:45.000 PM kernel[0]: AirPort: Link Up on en1
7/08/13 8:55:45.000 PM kernel[0]: en1: BSSID changed to 00:60:64:a3:48:94
7/08/13 8:55:45.000 PM kernel[0]: en1::IO80211Interface::postMessage bssid changed
7/08/13 8:55:45.000 PM kernel[0]: en1: 802.11d country code set to 'TW'.
7/08/13 8:55:45.000 PM kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165
7/08/13 8:55:46.000 PM kernel[0]: AirPort: RSN handshake complete on en1
7/08/13 8:55:46.818 PM configd[16]: network changed: v4(en1+:192.168.1.103) DNS+ Proxy+ SMB
7/08/13 8:55:46.830 PM UserEventAgent[11]: Captive: en1: Not probing 'McBain' (protected network)
7/08/13 8:55:46.841 PM configd[16]: network changed: v4(en1!:192.168.1.103) DNS Proxy SMB
7/08/13 8:55:46.928 PM airportd[1179]: _doAutoJoin: Already associated to “McBain”. Bailing on auto-join.
7/08/13 8:55:46.945 PM airportd[1179]: _doAutoJoin: Already associated to “McBain”. Bailing on auto-join.
7/08/13 8:55:46.960 PM airportd[1179]: _doAutoJoin: Already associated to “McBain”. Bailing on auto-join.
7/08/13 8:56:07.000 PM kernel[0]: disk0s2: I/O error.
7/08/13 8:56:07.848 PM PhotoStreamAgent[1043]: pread(30, 0x10c507000, 5242880, 10485760) failed: Input/output error
7/08/13 8:56:07.849 PM PhotoStreamAgent[1043]: MSPublishMMCSProtocol - 109183653 Could not compute signature for asset. Ignoring. <MSAsset: 0x7f829943e190> GUID: 2812882D-B3BE-4F7C-9E13-A8A3E9D4CB80 path: /Users/chrispicton2/Pictures/iPhoto Library/Masters/2013/06/30/20130630-231740/IMG_6140.CR2
Error: __NSCFError:
Domain  : com.apple.mmcs
Code    : 18
Desc    : Unable to calculate signature.
UserInfo: {
    NSDescription = "Unable to calculate signature.";
    NSLocalizedDescription = "Unable to calculate signature.";
7/08/13 8:56:07.971 PM com.apple.launchd[1]: (com.apple.xprotectupdater[1093]) Exited with code: 252
7/08/13 8:56:07.973 PM com.apple.backupd-helper[1178]: Not starting scheduled Time Machine backup - time machine destination not resolvable.
7/08/13 8:56:18.026 PM com.apple.usbmuxd[29]: _heartbeat_failed heartbeat detected detach for device 0x9-192.168.1.101:0!
7/08/13 8:56:28.000 PM kernel[0]: disk0s2: I/O error.
7/08/13 8:56:38.036 PM CalendarAgent[519]: [com.apple.calendar.store.log.caldav.queue] [Got error on refresh, but not rectifying principal because it was manually configured: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0x7fcabb639300 {NSUnderlyingError=0x7fcabb0b7250 "The request timed out.", NSErrorFailingURLStringKexxxxxxxxxxxxxxxxxxxxxxxxxNSLocalizedDescription=The request timed out.}]
7/08/13 8:56:38.037 PM CalendarAgent[519]: [com.apple.calendar.store.log.caldav.queue] [Accountxxxxxxxxxxxxxxxxxxxxxxmed out when executing operation: <CalDAVAccountRefreshQueueableOperation: 0x7fcabb61ad10; Sequence: 0>]
7/08/13 8:56:48.000 PM kernel[0]: disk0s2: I/O error
7/08/13 8:56:48.743 PM com.apple.launchd.peruser.502[316]: (com.apple.photostream-agent[1043]) Job appears to have crashed: Segmentation fault: 11
7/08/13 8:56:48.789 PM CalendarAgent[519]: [com.apple.calendar.store.log.caldav.queue] [Account refresh failed with error: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0x7fcabb62f440 {NSUnderlyingError=0x7fcabb0b7250 "The request timed out.", NSErrorFailingURLStringKeyxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxccountName=Google, CalDAVErrFromRefresh=YES, NSLocalizedDescription=The request timed out.}]
7/08/13 8:56:48.848 PM apsd[225]: <APSConnectionNotificationQueue: 0x7face1c6f560>: outstanding count -1 for com.apple.apsd-queue-port=com.apple.AddressBook.PushNotification-user=502 darkWakeEnabled-env=production
7/08/13 8:56:48.850 PM apsd[225]: <APSConnectionNotificationQueue: 0x7face1c6f560>: outstanding count -1 for com.apple.apsd-queue-port=com.apple.AddressBook.PushNotification-user=502 darkWakeEnabled-env=production
7/08/13 8:56:48.850 PM apsd[225]: <APSConnectionNotificationQueue: 0x7face1c6f560>: outstanding count -1 for com.apple.apsd-queue-port=com.apple.AddressBook.PushNotification-user=502 darkWakeEnabled-env=production
7/08/13 8:56:48.874 PM apsd[225]: <APSConnectionNotificationQueue: 0x7face302af20>: outstanding count -1 for com.apple.apsd-queue-port=com.apple.syncdefaultsd.push-user=502-env=production
7/08/13 8:56:48.875 PM apsd[225]: <APSConnectionNotificationQueue: 0x7face302af20>: outstanding count -1 for com.apple.apsd-queue-port=com.apple.syncdefaultsd.push-user=502-env=production
7/08/13 8:56:48.878 PM apsd[225]: <APSConnectionNotificationQueue: 0x7face302af20>: outstanding count -1 for com.apple.apsd-queue-port=com.apple.syncdefaultsd.push-user=502-env=production
7/08/13 8:56:48.879 PM apsd[225]: <APSConnectionNotificationQueue: 0x7face302af20>: outstanding count -1 for com.apple.apsd-queue-port=com.apple.syncdefaultsd.push-user=502-env=production
7/08/13 8:56:49.778 PM ReportCrash[1191]: Saved crash report for PhotoStreamAgent[1043] version 2.7 (45.19) to /Users/chrispicton2/Library/Logs/DiagnosticReports/PhotoStreamAgent_2013-08-07- 205649_localhost.crash
7/08/13 8:56:49.781 PM ReportCrash[1191]: Removing excessive log: file://localhost/Users/chrispicton2/Library/Logs/DiagnosticReports/PhotoStreamA gent_2013-08-06-231824_localhost.crash
7/08/13 8:56:51.132 PM com.apple.SecurityServer[17]: Killing auth hosts
7/08/13 8:56:51.132 PM com.apple.SecurityServer[17]: Session 100047 destroyed
7/08/13 8:56:51.153 PM com.apple.SecurityServer[17]: Session 100049 created
7/08/13 8:56:53.099 PM com.apple.dock.extra[547]: ApertureDockTilePlugin: Unable to get dock badge information: connection timeout: did not receive reply
7/08/13 8:56:53.100 PM com.apple.dock.extra[547]: iPhotoDockTilePlugin: Unable to get dock badge information: connection timeout: did not receive reply
7/08/13 8:57:11.000 PM kernel[0]: disk0s2: I/O error.
7/08/13 8:57:11.186 PM PhotoStreamAgent[1192]: pread(34, 0x10349f000, 5242880, 10485760) failed: Input/output error
7/08/13 8:57:11.187 PM PhotoStreamAgent[1192]: MSPublishMMCSProtocol - 109183653 Could not compute signature for asset. Ignoring. <MSAsset: 0x7ff3b980d860> GUID: 2812882D-B3BE-4F7C-9E13-A8A3E9D4CB80 path: /Users/chrispicton2/Pictures/iPhoto Library/Masters/2013/06/30/20130630-231740/IMG_6140.CR2
Error: __NSCFError:
Domain  : com.apple.mmcs
Code    : 18
Desc    : Unable to calculate signature.
UserInfo: {
    NSDescription = "Unable to calculate signature.";
    NSLocalizedDescription = "Unable to calculate signature.";
7/08/13 8:57:31.000 PM kernel[0]: disk0s2: I/O error.
7/08/13 8:57:37.000 PM kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=1198[GoogleSoftwareUp] clearing CS_VALID

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