ipad is synced with another itunes library??

I bought my ipad last Christmas and have been happily buying Apps etc through the direct wifi connection.

However I was trying to sync work videos through itunes when I hit a snag. I connected to my main computer (laptop) and got the following message.

"ipad is synced with another itunes library"

I didnt even realise I had synced the machine with any library before however I have one CD Album and 3 pod casts on the ipad (which I have no recall putting it on) so I guess it must have been synced at some point.

Note: (this may help someone who knows itunes better) The three podcasts are on my laptop under: C:\Users\Scott\Music\Podcasts - and I do remember downloading these through itunes which makes me think that this machine was the one I synced before. However I may have formatted the hard drive inbetween and copied these files over.

To add to my confusion I have 2 other PC's which I could have used. 1 however currentlly does not have itunes installed and the other one also says that it is synced with another itunes.

I think I may have copied files from a past itunes folder over the current folder on my main machine. Could this have deleted the "sync data"?

Questions

1. Can you tell from the ipad what computer it was synced with (any identifiers) - can you find any info on the pairing anywhere?

2. If you go for the erase and sync option (will this erase the apps bought?)

3. If I did find that I had synced with a random computer and wanted to change the itunes account to my laptop and then "re sync" the account, would I loose my saved progress/settings in apps I have currently?

End Goal: I need to have the ipad synced with my laptop. I dont care about the songs in the ipad (or data in the itunes on pc) but I dont want to loose the purchased apps and the saved game information etc. Any suggestions?

Thanks

Scott