Looking for tools and knowldge - .Net

[siko]

Hi,

I am dealing with a inventory application made by a company gone out of bussines 2 years ago and it turns out the program has a sort of tlme b0mb...

Long ago I fiddled with some decompilers, interrupts and hex editors just to learn and have some fun... so I wonder where I could find some tools now and, more importantly, information to re-learn how can I decompile and fix this.

The program is created with .Net stack, there is not much more I know about it so far. For the looks of it I might only need to find a single break point and change it.

Any help will be much valued.

Tnks.