As mentioned by chickendippers opening the case will not invalidate your warranty unless you cause damage to any of the components through neglect. The reason they fit the seal is to confirm to you that the computer hasn't been tampered with during the time it left the factory and arrived with you.
What motherboard do you have fitted? The workaround you have linked applies to Intel chipsets but normally the motherboards Mesh supply have Nvidia chipsets so that link wouldn't apply (proberbly why you can't find the heading in the BIOS).
There are a number of possible causes for the problems you are encountering. Firstly vlite is designed to be installed prior to the install of Vista. the fact that you already have Vista installed on your machine would require you to perform a complete format first, then install vlite, then install Vista.
Secondly the recovery disc provided by Mesh although containing a full version of Vista isn't the same as a retail disc therefore some features are missing. I assume vlite requires the full retail version.
Finally as vlite requires you to make a new iso copy of vista for the install it could be that this has somehow become corrupted or the disc damaged.
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