Your outlet may be wired backwards although there still needs to be a problem inside the computer, probably the power supply for this problem to happen. The suggestion someone is using the neutral for a ground is a good one. Also some "electricians" will use the ground wire for a neutral so they can convert a two wire cable to a three wire. I found this a lot in the Southwest in order to covert a single speed air conditioner to a two speed.
The ground must be separated from the neutral except at the service panel. Once the ground and neutral come in contact your ground becomes current carrying.
You may have a problem in your panel such as loose wiring. It's a good idea every 2-3 years to tighten up all the lugs in your service panel. A loose neutral can play havoc with your electronic equipment and actually burn up televisions, etc. I have seen panels catch fires from loose connections. The wires in the meter need to be tightened as well.
At the service panel the neutral should be grounded. It should be grounded NO WHERE ELSE!
If you have a multimeter turn off the power and check your receptacles with it. Use the ohm-meter to check the resistance between your ground and neutral. You should have no more than 7 ohms resistance between the two and closer to zero is desirable. If you have infinity then either your house is an older one or your ground is disconnected somewhere.
If your house was wired before the mid 60's it might have been wired in "flex" or flexible metal tubing. This will test as a ground but is not safe. This ground can start fires if there is a short to ground (ground fault). So called electricians will often replace older 2-prong receptacles with 3-prong receptacles. This is creates a hazardous situation. The only three prong receptacle that is safe to use on a 2-prong circuit is a GFCI receptacle. NO EXCEPTIONS!!
I understand what I have written is technical and may not make a lot of sense to a layman. If you want to make sure your house is properly wire have a COMPETENT, trained electrician translate it for you or get a licensed and reputable electrician to check your house. If he knows what he's doing it won't take long. A union trained electrician is usually a safe bet.
I have thirty years experience, have held two master electrician licenses and run my own company. I am aware of how many dangerous people are out there calling themselves electricians. I am not a union electrician but have hired them and they have always been well trained.