A NON INST RATED C210 PVT PLT IS ASSISTED BY CTR CTLR IN A VECTORED FLT ASSIST TO VFR CONDITIONS TOWARDS PLT'S DEST ARPT AT CULVER; OXI; IN.

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I WAS FLYING VFR ON TOP FROM ICT TO OXI WITH FLT FOLLOWING. I ALSO FILED A VFR FLT PLAN. DUE TO A COMPUTER MALFUNCTION; THE FLT PLAN COULD NOT BE OPENED WHEN I CALLED AFTER THE START OF THE FLT. I WAS TOLD; THAT THE FLT PLAN WOULD BE ACTIVATED WHEN THE COMPUTER MALFUNCTION RESOLVED. THE WX FORECAST AT MY DEST WAS FOR SCATTERED CLOUDS. DURING THE FLT THE CLOUD LAYER BECAME NEARLY SOLID WITH TOPS; AT TIMES; UP TO 14000 FT. I CALLED FSS AND WAS TOLD THE WX AT MY DEST SHOWED SCATTERED CLOUDS WITH CLR SKIES E OF MY DEST. I WAS FLYING E WITH 2 1/2 HRS OF FUEL. I WAS DSNDING FROM 15500 FT 40 MI W OF DEST; WHEN CLOUD TOPS STARTED RISING AROUND ME. THE TOPS WERE OVER 17000 FT AND RISING. IT DID NOT APPEAR THAT I COULD GET OVER THE CLOUDS WITHOUT ENTERING CLASS A AIRSPACE. I COULD NOT GO DOWN OR REVERSE COURSE WITHOUT ENTERING CLOUDS. (I AM NOT YET IFR RATED. I HAVE PASSED THE WRITTEN AND AM CURRENTLY PREPARING FOR THE CHK RIDE.) I ACCEPTED A VECTOR FROM THE ZOB CTLR FOR A DSCNT TO VFR CONDITIONS AT 9000 FT. THE REMAINDER OF THE FLT WAS UNEVENTFUL WITH A LNDG AT CULVER; IN. AFTER LNDG I WAS DELAYED IN CALLING THE FSS TO CANCEL MY VFR FLT PLAN. WHEN I WAS ABLE TO CALL; I WAS TOLD THAT MY FLT PLAN WAS NOT IN THE COMPUTER. I THINK THE CAUSE OF THE 1ST PROB (VFR ENTRY INTO IFR CONDITIONS) WAS THE RAPID CHANGE OF THE CLOUD LAYER NOT REFLECTED IN WX ADVISORY.