Macbook Pro and O.S Lion

So I have a MacBook Pro that is now 3 years old. I upgraded the OS to Lion back in July. It had worked fine until a week ago when my laptop started to freeze a lot. In addition, there are many different errors:
- I cannot save Word documents due to full of memory error
-Keychain cannot be found
-Cannot record using PhotoBooth
-Cannot uninstall programs
-Mail sometimes do not work properply
-Firefox says that a copy has already been open though there was none
-Wifi does not connect to network (signal is present) after turning the laptop on from sleep
-Black screen after open the laptop (from sleep mode).
I have brought my computer to Apple Store and they said there was nothing wrong with my hard drive. They told me to reinstall OS Lion, which I have already done. However, these problems occur again. Therefore, do you guys know what is going on ?

Let's take each issue one by one:
1. "I cannot save Word documents due to full of memory error"
What is the exact wording of the error? How much free space is on your hard drive? What version of Office are you using? Are you running the latest version? Have you posted in the http://www.microsoft.com/mac/support forums?
2. "Keychain cannot be found"
Keychains folder is in the user/Library folder which is not visible in Lion. From the Finder option click on the Go in the menu and select Library. Then you can get to the Keychains folder.
3.
4. "Cannot uninstall programs"
What program are you trying to uninstall? Why can't you drag the program to the Trash? have you tried?
5. "Mail sometimes do not work properply"
Please elaborate. Doesn't work, doesn't go, doesn't say much.
6. "Firefox says that a copy has already been open though there was none"
Reboot and launch Firefox. Still get the same prompt?
Let's deal with those and go onto the others later.

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