alfresco 0 Newbie Poster

I have a laptop computer(Sharp Mebius PC-CB1-CB). Just got it back from the repair shop after some serious keyboard problems. Working fine except I noticed a couple of times after not using the computer for a while( roughly 7 to 12 hour period), after returning my windows xp system would not load any sites. I typed in google.com and it wouldn`t load. It came up with systems 32 error. Funny thing is the computer was still connected, my msn messenger was still on line. I disconnected and then reconnected and everything worked fine. Sites would download as usual. Anyone know what might be the cause of this problem. It`s costing me a phone call reconnecting so to be able to load sites again. Cheers!