Open Anolder File So Clickd On The Word Document On Desktop

I ws workin on my Acer laptop with windows vista last evenin and I ws online surfin thru websites. i clickd on an email id on the web page by mistake.. so it tried to open Outlook to send an email. I hadnt used Outlook b4 on my lap so d setup opend and said tat outlook ws gona b installed. i closd tat dialog box cz i din wan to run dat setup. iv don tat many times b4 too. i continued surfin and in anoder 2 mins i clickd on anoder email id so d same dialog box popped up n i closed it again. i had a Word document opened and was copy-pastin stuf frm it to my email msg. i needed to open anoder file so clickd on d word document on my desktop.. and it said "preparin to instal ms word". i dint understand wt hapnd cz i ws already wrkn wit word and ws wonderin y d setup file of word had opened. i closed it and tried to open anoder word document and d same thin hapnd. i ws realllly surprised and clickd on the word doc which ws already open and tried to type sumthn.. it ws wrkn. i opened a new empty doc frm d doc which ws already open and it wrkd. den i closd the docs dat were open and clickd on ms word and dat setup dialogue box opend up again and word dint wrk no matter wt i tried. i ws really surprised and shockd cz evthin ws wrkn perfectly wel n within 2 mins my ms word seemd to b uninstalld! i closed internet explorer and the oder pdfs tat were open n tried to restart my lap. aftr restartin it i clickd on word n d same installation dialogue box came up. very surprisd i tried to restart again and dis time i cudnt even get into d login page.. sum error came up which said dat dere mite b sum software or hardware problem so i cudnt even gt the login page. dere wer 2 options available-

1. windows startup repair (recommended)
2. restart windows normally

i clickd on "restart windows normally" and a blank screen came up n js sht dwn in around 30 seconds. i clickd on the power button again n got the same 2 options frm which i selectd "startup repair".. d same blank screen came n d lap sht dwn in around 20 seconds. tried again and tis time the lap sht dwn b4 i cud get dose options. totally shockd i thot i needed to giv d lap sum rest cz i had been wrkn on it for a long time. i din tuch t for d nex 20 hrs and den tried again. i cud get the two options and i clickd on start windows normally and a blank screen came up and lap sht dwn. i tried again n selectd startup repair n it went thru d repair and said dat "system files corruped".. "boot error" .. "windows explorer not wrkn" etc.