How can i sync my iphone with itnes on a new pc.  when i tried to sync it said it will erase the contents on my iphone to sync with the new pc which has no contents

my old pc was running low in memory and i don't have enough space to back up in order to instal iOS5.  so i got a new pc, installed itunes on it but when i tried to sync my iphone on the new pc, it said it'll erase all contents on my iphone and sync with the new pc which has no contents. it says iphone can only sync with one machine. 
can you pls help

Syncing to a new iTunes library or computer will erase your phone. Only if you back up your phone manually before syncing, you can restore your device from that backup again. A manual backup does not include the sync process.
Do this:
Disable autosync in iTunes, connect your phone to your new computer and right click on it in the device list and choose backup. iTunes will backup your device without syncing.
Transfer your purchases the same way, choosing "transfer purchases" this time.
When you connect your phone for the first time, all media content will be erased. But you can restore your settings and app data from your manual backup afterwards.
Don't forget to set up at least one contact and event on your new computer to be able to merge calendars and contacts when you sync the iPhone for the first time.
Music is one way only, from the computer to your device, unless you bought the songs in iTunes and transferred your purchases.
There is 3rd party software out there, but not supported by Apple, see this thread: http://discussions.apple.com/thread.jspa?threadID=2013615&tstart=0
About backups and what's saved:iTunes: About iOS backups
How to back up and restore:http://support.apple.com/kb/HT1414
How to download apps for free again:http://support.apple.com/kb/HT2519
Saving other data is also described here. How to back up your data and set up as a new device
You can also back up iTunes and restore it on your new computer How to back up your media in iTunes , but the iPhone will be erased anyway during the first sync.

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