I have downloaded the new 7.0 but it wont upgrade on my pc.

i have xp on my computer it needs to have an updated firefox when i download the new update it goes through the whole thing but when i have it open to the net it still has my old version.

Click on the Apple icon on the left side of the tool bar and then "About this mac" - what operating system version does it list?
And you don't "download" icloud - icloud is a service that you turn on or off from System Preferences>iCloud.  If you don't have an iCloud icon in preferences, then you don't have Lion or Mountain Lion (10.7 or 10.8).

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