[quote name='flyfisher' timestamp='1361181562' post='1982186']
A UPS should certainly solve any PC-related power problems but might not be a full solution if other devices in the audio chain are still connected directly to the mains (e.g. amps, pedals etc). The pops and other noises might be coming from those devices. Also, the PSUs in PCs are usually pretty resilient to mains fluctuations. Still, a UPS might be worth a try and I can't see how it could make things worse.
I guessing that your location has a lot to do with the supply problems. Do your neighbours have similar problems? Are the problems fairly regular e.g. could it be that your house is supplied by a single mains supply that also powers the milking parlour on the farm next door? (OK, not necessarily that precise scenario, but you get my drift).
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My sister's house shared a very old cable with the neighbour, who used welders and other heavy sh*t in his workshop. The consequent dimming of the lights was very obvious and quite intrusive. She reported this to the supplier and they installed a recording voltmeter, and eventually upgraded the cables. End of problem.