Update Technology of an existing software

Hello all - Before place a bid read carefully Bid above U$240 will not be considered If you already have created a software for multiple users is an important plus. The attached file has better instructions. This software controls teams working on air conditioners maintanance. - it is a multi company software - Each company has it owns clients, so each company controls maintance of his clients. This solution will be online and each company may pay a monthly fee to use the software, so it must have an admin area to control the Companys. In other words, I have the software and I need to control my customers, and my customers need to control their clients. - Software has a few simple registers screens and some 4 or 5 more complex - Complex tables are 1- maintanance team and schedule (it means an agenda each team should visit each client), 2- air conditoner kinds, each kind needs special treatment has special routines that must be made monthly, semester...., 3 - - Software will have 6 reports - Reports must be adjustable, each company prints reports with it own logo and header I have the software developed in VB, I will provide you the VB version, but the VB version is for a single user and desktop based. The new version is for multiple users and web based I do preffer to be made using SQL Server or My SQL and .NET, but I am open to suggestions I need a full commeted project with the source code and a FULL explanation how to make changes and updates on the source code, database and how to install on a hostserver