Acer Aspire 5742G freezing issue

Hello. I have a rather annoying problem on my 5742g. In some multiplayer games (only ones so far I got the issue in were Ghost Recon Phantoms and Battlefield 3), the laptop freezes with a screeching looping sound. Nothing to do but unplug and replug it. I'm running Windows7. Reinstalled both that and the graphics driver. I have no idea what to do, I've tried a lot of things, including turning off the sound card. Thing is, the freezing happens randomly. Can be 30 minutes into the game or just 2. Also checked for overheating; it's not that. What I noticed is that the blue led, which I think is hard-drive related, stays on when the freezing occurs. Also, say, when I'm trying to open an Internet browser, sometimes, the blue led stays on, the cursor turns into its loading-thingy and it just stays like that for some rather long seconds, rendering me unable to do anything. And it's doing this with other things as well, like when opening random folders. Should I take it, then, that it's a hard-disk issue?

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GuruAid-CS

The issue seems with your hard-disk. To check the possibilities of hard-drive errors, we recommend you to run a disk check. You can do this in the following manner:

1. Open Computer by clicking the "Start" button, and then clicking "Computer".
2. Right-click the drive that you want to check, and then click "Properties". (In your case, we recommend to check all the drives one-by-one.)
3. Click the "Tools" tab, and then, under Error-checking, click "Check now". If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
(Note 1: To automatically repair problems with files and folders that the scan detects, select "Automatically fix file system errors". Otherwise, the disk check will report problems but not fix them. Additionally, if you select "Automatically fix file system errors" for a drive that's in use {for example, the partition that contains Windows}, you'll be prompted to reschedule the check for the next time you restart your computer.)
(Note 2: To perform a thorough check, select "Scan for and attempt recovery of bad sectors". This scan attempts to find and repair physical errors on the drive itself, and it can take much longer to complete.)
(Note 3: To check for both file errors and physical errors, select both "Automatically fix file system errors" and "Scan for and attempt recovery of bad sectors".)
4. Click "Start".

Depending on the size of your drive, this might take several minutes. For best results, don't use your computer for any other tasks while it is checking for errors.

If this does not resolve your issue, you may need to contact Acer Technical Support at the following link:
http://us.acer.com/ac/en/US/content/service