Ok thanks,
I've pretty new at all this particulalry with a Mac. I did it (I'm sure as it said) but I just got the dreaded swirling ball on startup. Eventually I had to reinstall ML. My computer seems better now (Macbook Air 13'), but the console is sill showing some errors; should I be concerned about these, particulalry the constant calendar agent ones:
30/04/13 5:18:23.483 PM lsboxd[371]: ISGetIconFamilyFromStorage: seed mismatch for 259f0005, actual seed is b9a3c9f5
1 OSServices 0x00007fff8eaae720 _ZL26ISGetIconFamilyFromStoragejPP17CIconStorageArrayPj + 140
2 OSServices 0x00007fff8eaae8c8 _ISReleaseStorageRefInternal + 33
3 OSServices 0x00007fff8eaae88e _ISReleaseStorageRefWithCache + 40
4 OSServices 0x00007fff8eaae7cb _ZL25ISReleaseImageRefInternalP16OpaqueISImageRefPPK9__CFArray + 72
5 OSServices 0x00007fff8eaae75e _ISReleaseImageRef + 49
6 OSServices 0x00007fff8eaa7b01 _ZN18SFLMutableListItem7DestroyEv + 23
7 OSServices 0x00007fff8eaa7acf _Z14SFLItemReleaseP16OpaqueSFLItemRef + 36
8 OSServices 0x00007fff8eaa9539 _ZN11SFLListBase7DestroyEv + 41
9 OSServices 0x00007fff8eaa94e6 _SFLReleaseSnapshot + 49
10 lsboxd 0x000000010fab0376 lsboxd + 9078
11 libdispatch.dylib 0x00007fff88fba0b6 _dispatch_client_callout + 8
12 libdispatch.dylib 0x00007fff88fbc29b _dispatch_source_invoke + 691
13 libdispatch.dylib 0x00007fff88fbb305 _dispatch_queue_invoke + 72
14 libdispatch.dylib 0x00007fff88fbb448 _dispatch_queue_drain + 180
15 libdispatch.dylib 0x00007fff88fbb2f1 _dispatch_queue_invoke + 52
16 libdispatch.dylib 0x00007fff88fbb1c3 _dispatch_worker_thread2 + 249
17 libsystem_c.dylib 0x00007fff8cba7d0b _pthread_wqthread + 404
18 libsystem_c.dylib 0x00007fff8cb921d1 start_wqthread + 13
30/04/13 5:18:30.626 PM CalendarAgent[335]: -[SOAPParser:0x7fcf3bc2bf70 parser:didStartElement:namespaceURI:qualifiedName:attributes:] Type not found in SOAPDocument for html (html)
30/04/13 5:18:30.627 PM CalendarAgent[335]: [com.apple.calendar.store.log.exchange.queue] [error = Error Domain=CalExchangeErrorDomain Code=-2 "Calendar can’t refresh the account “Work”." UserInfo=0x7fcf3ba08c20 {NSLocalizedFailureReason=The primary email address for the account can’t be found., CalFailedOperationKey=<CalExchangeSyncAccountOperation: 0x7fcf3b8b2d90>, NSLocalizedDescription=Calendar can’t refresh the account “Work”.}]
30/04/13 5:19:29.626 PM CalendarAgent[335]: -[SOAPParser:0x7fcf3bb95260 parser:didStartElement:namespaceURI:qualifiedName:attributes:] Type not found in SOAPDocument for html (html)
30/04/13 5:19:29.627 PM CalendarAgent[335]: [com.apple.calendar.store.log.exchange.queue] [error = Error Domain=CalExchangeErrorDomain Code=-2 "Calendar can’t refresh the account “Work”." UserInfo=0x7fcf3ba568b0 {NSLocalizedFailureReason=The primary email address for the account can’t be found.,