Actually, I just upgraded to Windows 7,and tried to do it the easy way,but ran into problems,so I went to a clean install which was tedious,but now FSX is running much better.I don't know if you save all your downloads,but I would certainly recommend it.Also,I hope you have receipts of all your purchases,as some suppliers use order numbers and register keys.Some suppliers are better than others and some will keep your records of purchases.CS and flightsimsto** are good with this,PHDG not so good.I always store my downloads either on DVD's or external disks and flash drives,because I don't want to pay extra fees for redownloading.
Anyway,Good luck and ask questions if you have problems.
Ron :D :D :D