If your outlet grounding is faulty or non-existent, you will continually face the problem of instability from the PC regardless of UPS or SMPS installed (not to mention possible damage to your components).
As a rule, grounding your outlets isn't too difficult (under ideal conditions) but I'm not going to advise about that here since there are factors (regulations etc.) that I am unfamiliar with in your area. You would want to check locally into that if you're in a single residence dwelling - if in an apartment, complain to your landlord, but there may be ways to jerry-rig grounding even then (I'll leave that to you to discover).
As much as I hate to say it, your VIP SMPS should work for now (as well as any would) since you aren't pulling too much power (the big complaint about VIP PSU's is the overstatement of power available). The problem with putting a UPS in the mix is that the UPS will want to be grounded and may complain (alarm) if grounding is not there
The gist of this "rant" is that grounding should be addressed before any other action (especially before purchases). Here we have outlet testers (like these
Images of outlet testers ) which show when the outlet is properly set up (checks ground and polarization) but I found nothing like that at Flipkart (they are handy)