Help needed on my lagging macbook pro!

Hey guys,
i bought my macbook pro not long ago (3 months ago in fact).
Its brand new, running on lion 10.7.4 (updated), 8GB ram memory.
A few days ago, i was doing my report and as usual i opened safari to do some research and suddenly it hanged with the color wheel running and then it stayed like that for about 10 minutes, i couldnt do anything, so i got fustrated and did a forced shut downby pressing the power button.
and when i turned it back on, i couldnt get to my start up page anymore. i goggled on my iphone and they reccommended a 'control+option+P+R' hold down option while it starts up. Good enough, apple restarted. and it took about 30 minutes and the login page appeared.
although i was glad my macbook pro came back alive but, the problems began.
Now i get the color wheel and lagging very often, even when i just logged into my account. even when i open just 2 windows on my safari, the color wheel appears.
I do not hear the fan sound anymore(usually happens when i open many applications or safari windows)
i really do not know what is wrong. I did a verify disk on my harddisk, it was fine.(i do not need to repair)
so im really confused. i can get a lag and the color wheel even when i am only using 2Gb of the system memory. (ive got 8GB ram)
Its just not functioning as it did before the above mentioned happened.
Anyone could help on this?
as for the disk usage, ive only used about 100GB of the harddisk.

Reinstalling Lion/Mountain Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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