Search not working in MOSS 2007

Hello,

We have Windows server 2008, MOSS 2007 deployed and the search in portal site was working perfectly but i always had error in my event viewer (ID 6398, 6482, 7076) the search stopped one time and i restarted the service and it work right back again. but a week ago we lost the search again (no results) the errors where still occuring i restarted the services and no luck!
i installed a hotfix for Microsoft windows (KB946517). The crawl is scheduled everyday at 2am so the first time after the hotfix is installed warning showed up in my event viewer:
---------------------------------------
Log Name:      Application
Source:        Office Server Search
Date:          2/24/2009 2:01:33 AM
Event ID:      2436
Task Category: Gatherer
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      Portal.xxx.xxx
Description:
The start address <http://portal> cannot be crawled.

Context: Application 'Main', Catalog 'Portal_Content'

Details:
      Crawling this document could not be completed because the remote server did not respond within the specified timeout. Try crawling the server later, or increase the timeout value. You may also try scheduling crawls during off-peak usage times.   (0x80040d7b)
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Office Server Search" />
    <EventID Qualifiers="32768">2436</EventID>
    <Level>3</Level>
    <Task>3</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2009-02-24T00:01:33.000Z" />
    <EventRecordID>17589</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Portal.xxx.xxx</Computer>
    <Security />
  </System>
  <EventData>
    <Data>

Context: Application 'Main', Catalog 'Portal_Content'

Details:
      Crawling this document could not be completed because the remote server did not respond within the specified timeout. Try crawling the server later, or increase the timeout value. You may also try scheduling crawls during off-peak usage times.   (0x80040d7b)</Data>
    <Data>http://portal</Data>
  </EventData>
</Event>

------------------------------------
and the next day errors occured
------------------------------------

Log Name:      Application
Source:        Office Server Search
Date:          2/25/2009 1:59:05 AM
Event ID:      10036
Task Category: Gatherer
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Portal.xxx.xxx
Description:
A database error occurred.

Source: Microsoft OLE DB Provider for SQL Server
Code: 1205 occurred 1 time(s)
Description: Transaction (Process ID 89) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.

Context: Application 'Main'
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Office Server Search" />
    <EventID Qualifiers="49152">10036</EventID>
    <Level>2</Level>
    <Task>3</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2009-02-24T23:59:05.000Z" />
    <EventRecordID>17632</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Portal.xxx.xxx</Computer>
    <Security />
  </System>
  <EventData>
    <Data>

Context: Application 'Main'</Data>
    <Data>Microsoft OLE DB Provider for SQL Server</Data>
    <Data>1205</Data>
    <Data>1</Data>
    <Data>Transaction (Process ID 89) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.</Data>
  </EventData>
</Event>
-----------------------------------

Log Name:      Application
Source:        Office Server Search
Date:          2/26/2009 1:59:03 AM
Event ID:      2436
Task Category: Gatherer
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      Portal.xxx.xxx
Description:
The start address <sps3://mysite> cannot be crawled.

Context: Application 'Main', Catalog 'Portal_Content'

Details:
      Access is denied. Check that the Default Content Access Account has access to this content, or add a crawl rule to crawl this content.   (0x80041205)
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Office Server Search" />
    <EventID Qualifiers="32768">2436</EventID>
    <Level>3</Level>
    <Task>3</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2009-02-25T23:59:03.000Z" />
    <EventRecordID>17639</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Portal.xxx.xxx</Computer>
    <Security />
  </System>
  <EventData>
    <Data>

Context: Application 'Main', Catalog 'Portal_Content'

Details:
      Access is denied. Check that the Default Content Access Account has access to this content, or add a crawl rule to crawl this content.   (0x80041205)</Data>
    <Data>sps3://mysite</Data>
  </EventData>
</Event>
----------------------------------


Please help it's so annoying not to have search working in my portal

Thank you